tag:blogger.com,1999:blog-306223714360567032024-03-05T01:21:52.752-08:00Electronic Schematic DiagramThe collection of electronic circuit - schematics. Power supply, audio, microcontroller, digital circuits, analog circuits and more...schematic diagramhttp://www.blogger.com/profile/10351645467260086674noreply@blogger.comBlogger201125tag:blogger.com,1999:blog-30622371436056703.post-23911882623986501142015-03-27T22:26:00.004-07:002015-03-27T22:26:42.982-07:00Rain Detector Alarm<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgaWD2UHGU0SxYG3yDh8fZaYCOGx590nAGto4bxFdDakLnUggAss2SE9OGPwvjJDFRv-icsGH2_9AdDruUof6OPJou_dDXDY9V95UlqTgLCMhTNpJflSjX0HLbLt1wYy399cK9SOG3fqN4/s1600/rain+detector+circuit.gif" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgaWD2UHGU0SxYG3yDh8fZaYCOGx590nAGto4bxFdDakLnUggAss2SE9OGPwvjJDFRv-icsGH2_9AdDruUof6OPJou_dDXDY9V95UlqTgLCMhTNpJflSjX0HLbLt1wYy399cK9SOG3fqN4/s320/rain+detector+circuit.gif" /></a></div>
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This is the circuit diagram of rain detector alarm. When the sensor is wetted with the water, then the alarm will be activated. This circuit can be used for other purposes.<br />
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A 555 astable multivibrator is used here which gives a tone of about 1kHz upon detecting water. The sensor when wetted by water completes the circuit and makes the 555 oscillate at about 1kHz. The sensor is also shown in the circuit diagram.<br />
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It has to placed making an angle of about 30 – 45 degrees to the ground. This makes the rain water to flow through it to the ground and prevents the alarm from going on due to the stored water on the sensor.<br />
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The metal used to make the sensor has to be aluminium and not copper. This is because copper forms a blue oxide on its layer on prolonged exposure to moisture and has to be cleaned regularly. The aluminium foils may be secured to the wooden / plastic board via epoxy adhesive or small screws. The contact X and Y from the sensor may be obtained by small crocodile clips or you may use screws.schematic diagramhttp://www.blogger.com/profile/10351645467260086674noreply@blogger.com0tag:blogger.com,1999:blog-30622371436056703.post-65720053660523687742014-11-18T03:30:00.002-08:002014-11-18T03:31:13.654-08:00Two Tone Electronic Siren Circuit<span class="" id="result_box" lang="en"> <span class="hps"> </span></span><br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgaMmjbnwdN2FqqWDPK4GUoMRxH1OCJBMwetzx6wd8a7P1lr4Ul0wXdzetZpDpDwCI0UgqxyIgarsO1Mh2KijbfD4SQo_MNimQ-ezpP8tFME0dn6WpiXgx_ca1VJhv_YYnTBSsMN6PSzMo/s1600/Two+Tone+Electronic+Siren+Schematic+Diagram.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgaMmjbnwdN2FqqWDPK4GUoMRxH1OCJBMwetzx6wd8a7P1lr4Ul0wXdzetZpDpDwCI0UgqxyIgarsO1Mh2KijbfD4SQo_MNimQ-ezpP8tFME0dn6WpiXgx_ca1VJhv_YYnTBSsMN6PSzMo/s1600/Two+Tone+Electronic+Siren+Schematic+Diagram.jpg" height="186" width="400" /></a></div>
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This is the circuit diagran of two tone electronic siren. The scheme is simple and easy to built, it based on two ICs with different task: produce audio signal and amplify the audio signal.<br />
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<b>List of Components:</b><br />
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R1-R2-R3: 2.2KΩ<br />
R4: 1KΩ <br />
R5: 10K (potentiometer)<br />
R6: 470Ω<br />
C1 - C2: 10 uF<br />
C3 - C4: 470 nF<br />
C5: 10 uF<br />
C6: 220 uF <br />
IC1: Integrated Circuit TTL 7400<br />
IC2: LM386<br />
Z1: Zener 5 volts 1/2 watt<br />
Speaker 8 Ω<br />
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The IC 7400 used to provide the ringtone signals., while the frequency of the sound produced is determined by the capacitors C3 and C4, and the modulation frequency is determined by the capacitors C1 and C2. The signal from the oscillator, implemented with the IC1 (7400), are applied to R5 which functions as volume control and amplified by the IC2.<br />
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If you want a siren with a higher volume, you can change the amp, you should only consider that the IC1 works with 5 volts, and reducing the supply voltage (R6 and Z1 should be change). For example, if you placed a amplifcador operate on 12 volts, R5 should be approximately 2.8 to 3 ohms.<br />
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Circuit Note:<br />
The circuit published here is not tested yet, well-functioning or not is responsibility of the assembler.schematic diagramhttp://www.blogger.com/profile/10351645467260086674noreply@blogger.com0tag:blogger.com,1999:blog-30622371436056703.post-53762993386732403232014-06-19T23:26:00.003-07:002014-06-19T23:26:51.654-07:00PWM Controller Circuit using SN75603 and SN75604<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhnc0IisTyFEjJCT827tt9YY4wAI6owt12WWMb5uqps9qU8O6u6AuIX8LGjvWzWhVGDnPrygepeiFxuaEuGpUT13P2YnblNyMFnW1Y6_8YOdsQKx2EDaohZ3wNHUF6n2mDgaJbcPVwPwNY/s1600/PWM+Controller+Circuit+SN75603+and+SN75604.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhnc0IisTyFEjJCT827tt9YY4wAI6owt12WWMb5uqps9qU8O6u6AuIX8LGjvWzWhVGDnPrygepeiFxuaEuGpUT13P2YnblNyMFnW1Y6_8YOdsQKx2EDaohZ3wNHUF6n2mDgaJbcPVwPwNY/s1600/PWM+Controller+Circuit+SN75603+and+SN75604.jpg" height="255" width="320" /></a></div>
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Here the circuit diagram of PWM Controller which uses complementary half-H peripheral drivers SN75603 and SN75604, with totem-pole outputs rated at 40 V and 2.0 A. These drivers effectively place the motor in a full-bridge configuration, which has the ability to provide bidirectional control. <br />
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Timer U1 operates in the astable mode at a frequency of 80 Hz. The 100-Ω discharge resistor results in an 8-μs trigger pulse which is coupled to the trigger input of timer U2. Timer U2 serves as the PWM generator. Capacitor C1 is charged linearly with a constant current of 1 mA from the 1N5297, which is an FET current-regulator diode. Motor speed is controlled by feeding a dc voltage of 0 to 10 V to control input pin 5 of U2. As the control voltage increases, the width of the output pulse pin 3 also increases. These pulses control the on/off time of the two motor drivers. The trigger pulse width of timer U1 limits the minimum possible duty cycle from U2. schematic diagramhttp://www.blogger.com/profile/10351645467260086674noreply@blogger.com0tag:blogger.com,1999:blog-30622371436056703.post-21588673840388207722014-06-19T21:28:00.002-07:002014-06-19T21:30:54.163-07:00USB Cellphone Charger<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg27aT7gqnSx7-wTUULJBqiHnvWKTkuoaqFA81Cx2ghyphenhyphen4htFkGokAVkQ3v2qICFhNfTgZRSBk6oLOj-MZfaFWN-RV4jE4c3ce5f1LGHV6-HnT2gSPHy3ljDmnYPab5BD-iF2aUrV-SIgIU/s1600/USB+Cellphone+Charger+schematic.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg27aT7gqnSx7-wTUULJBqiHnvWKTkuoaqFA81Cx2ghyphenhyphen4htFkGokAVkQ3v2qICFhNfTgZRSBk6oLOj-MZfaFWN-RV4jE4c3ce5f1LGHV6-HnT2gSPHy3ljDmnYPab5BD-iF2aUrV-SIgIU/s1600/USB+Cellphone+Charger+schematic.png" height="182" width="320" /></a></div>
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This is the schematic diagram of cellphone <a href="http://skema-elektronik.blogspot.com/search/label/battery%20charger">charger circuit</a> which connecter to the USB as main power. Whit this circuit, you can charger your cell phone from USB port in your PC or notebook.<br />
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The majority of the cellphones battery is appraised 3.6 volts at 1000 to 1300 mah. These battery packs have 3 Nimh or Lithium cells having 1.2 volt rating. Generally the battery pack requires 4.5 volts and 300-500 mA current for quick charging. Anyway, low present charging is better to build the proficiency of the battery. The circuit depicted here gives 4.7 directed voltage and sufficient present for the moderate charging of the cellphone. <br />
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Transistor T1 is utilized to give the regulated output. Any medium power NPN transistor like TIP122, Cl100, BD139 could be utilized. Zener diode ZD controls the output voltage and D1 protects the polarity of the output supply. Front end of the circuit ought to be joined with A type USB plug. Connect a red wire to pin1 and black wire to pin 4 of the plug for easy polarity identification. Connect the output to a suitable charger pin to connect it with the mobile phone. After assembling the circuit, insert the USB plug into the socket and measure the output from the circuit. If the output is OK and polarity is correct, connect it with the cellphone.schematic diagramhttp://www.blogger.com/profile/10351645467260086674noreply@blogger.com0tag:blogger.com,1999:blog-30622371436056703.post-66432604960057350662012-07-29T15:44:00.000-07:002012-07-29T15:44:06.305-07:001.3-12V Small Variable Power Supply<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhh9HF8zylN2i4PNwrytzYVPISroRttVf2F_2zYVercI5Obr6gNVPJCMgRExPapqZsOvo7BaRQTQe19GuiFy4w_R2Ic78v0Eom2Y6WvrSOcG5UqL631C8fL7UPFVhE6zZgpBQWu_a4KhzI/s1600/1.3-12v+small+variable+power+supply.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="76" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhh9HF8zylN2i4PNwrytzYVPISroRttVf2F_2zYVercI5Obr6gNVPJCMgRExPapqZsOvo7BaRQTQe19GuiFy4w_R2Ic78v0Eom2Y6WvrSOcG5UqL631C8fL7UPFVhE6zZgpBQWu_a4KhzI/s320/1.3-12v+small+variable+power+supply.jpg" width="320" /></a></div>
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This is a small variable power supply delivers adjustable output voltage of 1.3v-12v. The current output determined by R3. With current setting (see part list), it will deliver current output about 1A.<br />
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<b>Detail Specification:</b><br />
Output (approximate values):<br />
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Vmin = (R4 + R5) / (R5*1.3)<br />
Vmax = (7.15 / R5) * (R4 + R5)<br />
Imax = 0.65/R3<br />
Max. Power on R3: 0.42/R3<br />
Min. Input DC Voltage (pin 12 to pin 7): Vmax + 5<br />
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<b>Parts List</b><br />
B1 = 40V/2.5A<br />
R1 = 1k ohm<br />
R2 = Potensiometer 5k ohm<br />
R3 = 0.56R/2W<br />
R4 = 3.3k ohm<br />
R5 = 4.7k ohm<br />
C1 = 2200uF (3300uF even better)<br />
C2 = 4.7uF<br />
C3 = 100nF<br />
C4 = 1nF<br />
C5 = 330nF<br />
C6 = 100uF<br />
D1 = Green LED<br />
D2 = 1N4003<br />
F1 = 0.2A F<br />
F2 = 2A M<br />
IC1 = LM723 (in a DIL14 plastic package)<br />
S1 = 250V/1A<br />
T1 = 2N3055 on a heatsink 5K/W<br />
TR1 = 220V/17V/1.5 <br />
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R2 sets the output voltage. The maximum current is decided by the value of R3: the over-current protection <a href="http://electropart.info/" target="_blank">circuitry</a> inside the LM723 senses the voltage across R3 and starts shutting the output stage off as soon as this voltage approaches 0.65 V. This way the current through R3 can never exceed 0.65/R3, even if the output is shorted.<br />
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C3 and C4, both ceramic, must be placed as close as possible to the integrated circuit, because the LM723 can be prone to unwanted oscillations. It is not an overkill to solder them directly (and very carefully) to the pins of the IC. All other connections should also be kept short.<br />
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The LM723 works with input DC voltages from 9.5 to 40 V and the IC itself can source some 150 mA if the output voltage is not more than 6-7 V below the input. When an external pass transistor is used (in the usual emitter-follower mode), the base-emitter junction of T1 represents a significant resistance and the integrated circuit's output stage is relatively lightly loaded. All the current drawn by the load passes through T1 and it dissipates an amount of power that is directly proportional to the current and the difference between the input and the output DC voltage.schematic diagramhttp://www.blogger.com/profile/10351645467260086674noreply@blogger.com0tag:blogger.com,1999:blog-30622371436056703.post-40342983969885416172012-06-03T21:42:00.000-07:002012-06-03T21:42:33.855-07:00220V Light-Operated On/Off Switch<div style="text-align: center;">
<a href="http://schematics.circuitdiagram.net/viewer.php?id=bfi1338783537f.jpg" rel="external nofollow" target="_blank" title="220V Light-Operated On/Off Switch"><img alt="220V Light-Operated On/Off Switch circuit diagram" border="0" src="http://schematics.circuitdiagram.net/thumbs/bfi1338783537f.jpg" /></a></div>
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This <a href="http://skema-elektronik.blogspot.com/">schematic diagram</a> is a light-operated, remote-controlled solidstate switch circuit to handle lamp. While in darkness, the resistance of Light Dependent Resistor (LDR) is extremely hight, it shoots up to megohm range. As a result, the triac isn't going to have gate drive and therefore it doesn't conduct.<br />
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When LDR is lighted by way of a torch-light beam, the level of resistance of LDR immediately reduces (under 10Kohm). This leads the triac to conduct and turn on the lamp. Light received from your lamp (normal lamp in the room, not from the torch) will keep LDR’s resistance low. So, the lamp stays continually "on". When the lamp is ‘on’, it could be turned "off’ once again by disturbing the light falling on LDR, by either waving hand in front of it or by disturbing <a href="http://skema-elektronik.blogspot.com/search/label/power%20supply">power source</a> for the circuit for just a moment.<br />
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RFC applied right here could be built by winding about 15 turns of 18 SWG wire over an insulated ferrite rod.<br />
<i>Circuit title: 220V Light-Operated On/Off Switch</i>. This kind of circuit also can be modified to make a alarm circuit for security purpose.schematic diagramhttp://www.blogger.com/profile/10351645467260086674noreply@blogger.com0tag:blogger.com,1999:blog-30622371436056703.post-31891091910788065332012-04-20T20:30:00.003-07:002012-04-20T20:30:24.483-07:00Gold Detector Schematic<div style="text-align: center;">
<a href="http://schematics.circuitdiagram.net/viewer.php?id=cqs1334978126y.gif" rel="nofollow" target="_blank" title="Gold Detector Schematic diagram"><img alt="Gold Detector Schematic circuit diagram" border="0" src="http://schematics.circuitdiagram.net/thumbs/cqs1334978126y.gif" /></a></div>
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Here the very simple and easy build gold detector circuit. The circuit capable to sense gold or metal or coins from a distance of about 20cm, depending on the size of the object to detect.<br />
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The circuit oscillates at about 140kHz and a harmonic of this frequency is detected by an AM radio. You can simply tune the radio receiver until a squeal is detected.<br />
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When the search coil is placed near a metal object, the frequency of the <a href="http://circuitdiagram.net/">circuit</a> will change and this will be heard from the speaker of AM radio.<br />
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Below image is the construction of the circuit, you will see that the radio is placed on the hand stick of the complete detector.<br />
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<a href="http://schematics.circuitdiagram.net/viewer.php?id=cqs1334978363h.gif" rel="nofollow" target="_blank" title="gold detector construction"><img alt="gold detector construction" border="0" src="http://schematics.circuitdiagram.net/thumbs/cqs1334978363h.gif" /></a></div>
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<a href="http://schematics.circuitdiagram.net/viewer.php?id=jdv1334978435g.gif" rel="nofollow" target="_blank" title="gold detector coil"><img alt="gold detector coil" border="0" src="http://schematics.circuitdiagram.net/thumbs/jdv1334978435g.gif" /></a></div>
<br />schematic diagramhttp://www.blogger.com/profile/10351645467260086674noreply@blogger.com0tag:blogger.com,1999:blog-30622371436056703.post-5854711798678434022012-04-01T18:41:00.000-07:002012-04-01T18:41:25.667-07:00Simple Intercom Circuit with Transistors<div style="text-align: center;">
<a href="http://schematics.circuitdiagram.net/viewer.php?id=rgh1333330186v.jpg" rel="nofollow" target="_blank" title="Simple Intercom Circuit with Transistor"><img alt="Simple Intercom Circuit with Transistor" border="0" src="http://schematics.circuitdiagram.net/thumbs/rgh1333330186v.jpg" /></a></div>
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This is a 2-station simple intercom circuit build based on transistors part and using common 8R mini speakers. The speaker works as microphone and generate sound, so there is no need microphone for this intercom. The "press-to-talk" switches should have a spring-return so the intercom can never be left ON, push on switch can be used for this kind of task. <br />
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The secret to preventing instability (motor-boating) with a high gain circuit like this is to power the speaker from a separate <a href="http://powersupply88.com/" target="_blank" title="power supply circuit design">power supply</a>! You can connect an extra station (or two extra stations) to this <a href="http://circuitdiagram.net/" target="_blank" title="electronic circuit design">circuit design</a>.<br />
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Build the circuit into two separated boxes (for 2 stations). On each box should be use 2 ports for external power supply port (if you use external power supply, not battery) and connection port to other stations. Create some holes for speaker push on switch.schematic diagramhttp://www.blogger.com/profile/10351645467260086674noreply@blogger.com0tag:blogger.com,1999:blog-30622371436056703.post-75380972549162313362012-03-11T21:34:00.000-07:002012-03-11T21:34:59.177-07:00Interior Light Fader for Automobile<div style="text-align: center;">
<a href="http://schematics.circuitdiagram.net/viewer.php?id=opt1331522608g.jpg" rel="nofollow" target="_blank" title="Interior Light Fader for Automobile schematic diagram"><img alt="Interior Light Fader for Automobile circuit diagram" border="0" src="http://schematics.circuitdiagram.net/thumbs/opt1331522608g.jpg" /></a></div>
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Here the circuit diagram of Interior Light Fader for Automobile. The circuit is build using low power operational amplifier LM324 which only need around 3mA of current, so it won't bother the battery supply if left connected for extended periods. This circuit is similar to the fading eyes circuit above and is used to slowly brighten and fade interior lights of older cars.<br />
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The top two op-amps circuit module (pins 1,2,3 and 5,6,7) form a triangle wave oscillator running at about 700Hz while the lower op-amp (pins 8,9,10) produces a linear, 5 second ramp, that moves up or down depending on the position of the door switch. The two transistors and associated <a href="http://skema-elektronik.blogspot.com/2008/11/resistor-explanation.html">resistors</a> serve to limit the ramp voltage to slightly more and less than the upper and lower limits of the triangle waveform. These two signals (700 hZ. triangle wave and 5 second ramp) are applied to the inputs of the 4th op-amp (pins 12,13,14) that serves as a voltage comparator and produce a varying duty cycle square wave that controls the IRFZ44 MOSFET and lamp brightness. The 5 second fade time can be adjusted with the 75K resistor connected to the door switch. A larger value will increase the time and a smaller value will speed it up.<br />
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When the door switch is closed (car door open) the voltage on pin 8 slowly increase above the negative peaks of the triangle wave producing a short duty cycle output and a dim light. As the ramp moves farther positive, a greater percentage of the triangle wave will be lower than the ramp voltage producing a wider pulse and brighter light. This process continues until the ramp is 100% above the positive peaks of the triangle wave and the output is maximum. When the door switch is open, the reverse action takes place and the lamps slowly fade out.<br />
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The MOSFET IRFZ44 shouldn't need a heatsink if the total load is 50 watts or less but the temperature of the MOSFET should be monitored to make sure it doesn't overheat. The on-state resistance is only 0.028 ohms so that 4A of current (48 watts) is only around 100mW. For larger loads, a compact heatsink can be added to keep the MOSFET cool. - <i>Interior Light Fader for Automobile circuit diagram</i>schematic diagramhttp://www.blogger.com/profile/10351645467260086674noreply@blogger.com0tag:blogger.com,1999:blog-30622371436056703.post-53172103604744484862012-02-27T02:50:00.000-08:002012-02-27T02:50:05.800-08:00Dynamic Mic Amplifier (To Use Speaker as Microphone)<div style="text-align: center;">
<a href="http://schematics.circuitdiagram.net/viewer.php?id=cqs1330339204i.jpg" rel="nofollow" target="_blank" title="Dynamic Mic Amplifier (To Use Speaker as Microphone)"><img alt="Dynamic Mic Amplifier (To Use Speaker as Microphone)" border="0" src="http://schematics.circuitdiagram.net/images/cqs1330339204i.jpg" /></a></div>
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This is the circuit diagram of dynamic mic amplifier. This simple and easy built circuit can be used as a subtitute of an electret microphone. It will turn an ordinary mini speaker to become a pretty sensitive microphone.<br />
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Any NPN transistors can be applied for this circuit, for example: BC547. The circuit will operated from 3v to 9v DC supply. The amplifier configuration used in this dynamic mic amplifier is a common-base <a href="http://amplifiercircuit.net/" target="_blank" title="amplifier circuit">amplifier</a>, it accepts the low impedance of the speaker to deliver a gain of more than 100 times.schematic diagramhttp://www.blogger.com/profile/10351645467260086674noreply@blogger.com0tag:blogger.com,1999:blog-30622371436056703.post-49877605252744625792012-02-20T00:51:00.000-08:002012-02-20T00:51:46.157-08:00Basic Oscillator Circuit using Two Transistors<div style="text-align: center;"><a href="http://schematics.circuitdiagram.net/viewer.php?id=bfi1329725199w.jpg" rel="nofollow" target="_blank" title="Basic Oscillator Circuit using Two Transistors"><img alt="Basic Oscillator Circuit using Two Transistors" border="0" src="http://schematics.circuitdiagram.net/thumbs/bfi1329725199w.jpg" /></a></div><br />
This is the <a href="http://skema-elektronik.blogspot.com">schematic diagram</a> of basic oscillator circuit which using two transistors. When two transistors and a couple of passive components are connected as shown in the figure, the circuit starts to oscillate. The frequency of oscillation can be adjusted by changing the values of either the resistor or the capacitor. <br />
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For easier experiment, you may replace the resistor with 10K potensiometer. By increasing its frequency to a suitably high level, it can be used to drive a speaker or a buzzer to produce an audio <a href="http://skema-elektronik.blogspot.com/search/label/alarm">alarm</a> note. By sufficiently reducing its frequency, the <a target="_blank" title="circuit diagram" href="http://circuitdiagram.net">circuit</a> may be used to flash a LED as a warning indicator.<br />
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The another circuit of two transistors oscillator described in the following video:<br />
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<div style="text-align:center;"><object type="application/x-shockwave-flash" style="width:320px; height:265px;" data="http://www.youtube.com/v/Vc9LKArZYFU"><param name="movie" value="http://www.youtube.com/v/Vc9LKArZYFU" /></object> </div>schematic diagramhttp://www.blogger.com/profile/10351645467260086674noreply@blogger.com0tag:blogger.com,1999:blog-30622371436056703.post-37393064915776805432012-02-14T19:46:00.000-08:002012-02-14T19:46:01.916-08:00One Transistor LED Flasher Circuit<div style="text-align: center;">
<a href="http://schematics.circuitdiagram.net/viewer.php?id=bwy1329276710p.jpg" rel="nofollow" target="_blank" title="One Transistor LED Flasher Circuit diagram"><img alt="One Transistor LED Flasher Circuit circuit diagram" border="0" src="http://schematics.circuitdiagram.net/images/bwy1329276710p.jpg" /></a></div>
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Here the <a href="http://skema-elektronik.blogspot.com/">schematic diagram</a> of one transistor LED flasher. This circuit can be the simplest circuit led flasher over the world.... :D<br />
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This is a novel flasher circuit working with a single driver transistor that will take its flash-rate from a flashing LED. The flasher in the photo is 3mm. An ordinary LED is not going to work. The flash rate are not able to be altered by the brightness of the high-bright white LED can be adjusted by replacing the 1k resistor across the 100uF electrolytic to 4k7 or 10k.<br />
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The 1k resistor discharges the 100uF so that when the transistor turns on, the charging current into the 100uF illuminates the white LED. If a 10k discharge resistor is applied, the 100uF will not be completely discharged and also the LED isn't going to flash as bright.<br />
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<div style="text-align: center;">
<a href="http://schematics.circuitdiagram.net/viewer.php?id=rgh1329276777v.jpg" rel="nofollow" target="_blank" title="One Transistor LED Flasher schematic diagram"><img alt="One Transistor LED Flasher electronic circuit diagram" border="0" src="http://schematics.circuitdiagram.net/thumbs/rgh1329276777v.jpg" /></a></div>
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All of the components within the photo are in the identical places as in the <a href="http://circuitdiagram.net/" target="_blank" title="electronic circuit diagram">circuit diagram</a> in making it easy to learn how the components are joined.schematic diagramhttp://www.blogger.com/profile/10351645467260086674noreply@blogger.com0tag:blogger.com,1999:blog-30622371436056703.post-16778952267063876602012-02-05T20:03:00.000-08:002012-02-05T20:03:12.966-08:00Magic Lights Circuit using Bi-Colour LED<div style="text-align: center;"><a href="http://schematics.circuitdiagram.net/viewer.php?id=bwy1328498494m.jpg" rel="external nofollow" target="_blank" title="Magic Lights Circuit using Bi-Colour LED schematic diagram"><img alt="Magic Lights Circuit using Bi-Colour LED circuit diagram" border="0" src="http://schematics.circuitdiagram.net/thumbs/bwy1328498494m.jpg" /></a></div><br />
This is the magic lights circuit which use bi-colour LED as the output to provide the light. The circuit uses 14 bi-colour (red and green) LEDs having 3 terminals each. Various dancing colour patterns are generated utilizing this circuit considering that each LED can create three various colours. The middle terminal (pin 2) of the LEDs will be the common cathode pin that is grounded. When a positive voltage is applied to pin one, it emits red light. Similarly, when positive voltage is applied to pin 3. it emits green light. And when positive voltage is simultaneously applied to its pins 1 and 3, it emits amber light. <br />
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The <a href="http://circuitdiagram.net/" target="_blank" title="circuit diagram">circuit</a> could be implemented for decorative lights. The IC1 (timer IC 555) is applied in astable mode of multivibrator to produce clock signal for IC2 and IC3 (CD4518) that are dual BCD counters.<br />
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The two counters of each one of these ICs have already been cascaded to acquire 8 outputs from each. The outputs from IC2 and IC3 are connected to IC4 through IC7 that are BCD to 7-segment latch/decoder/driver ICs. Therefore we acquire a complete of 14 segment outputs from each of the IC pairs composed of IC4 plus IC5 and IC6 plus IC7. While outputs from former pair are connected to pin No. 1 of all the 14 bi-colour LEDs through current limiting resistors, the ouputs of the latter pair are similarly connected to pin No.3 of all the bi-colour LEDs to acquire a magical dancing lights effect.schematic diagramhttp://www.blogger.com/profile/10351645467260086674noreply@blogger.com0tag:blogger.com,1999:blog-30622371436056703.post-18528134538964136392012-01-29T19:17:00.000-08:002012-01-29T19:17:00.179-08:00Simple Audio Booster<div style="text-align: center;">
<a href="http://schematics.circuitdiagram.net/viewer.php?id=rgh1327546496p.png" rel="nofollow" target="_blank" title="Simple Audio Booster"><img alt="Simple Audio Booster" border="0" src="http://schematics.circuitdiagram.net/thumbs/rgh1327546496p.png" /></a></div>
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This is a simple and low-cost audio booster circuit design. The circuit is based on general purpose amplifier and switches, 2N3392 transistor packed in TO-92. This circuit should be installed before power amplifier module.<br />
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To get the maximum audio performance, use metalfilm resistors, MKM and tantalum capacitors which have small tolerance of its value. Also, use stabilized and regulated 9V <a href="http://powersupply88.com/" target="_blank">power supply</a> for better result. You can simply use LM7809 IC regulator on 12V power supply to get stabilized 9V output. The 100K variable resistor is used to adjust the volume, you may remove this component and use main volume in your audio system.schematic diagramhttp://www.blogger.com/profile/10351645467260086674noreply@blogger.com0tag:blogger.com,1999:blog-30622371436056703.post-6846033531829457332012-01-24T23:00:00.000-08:002012-01-24T23:00:19.228-08:00Cricket Chirping Sound Generator<div style="text-align: center;">
<a href="http://schematics.circuitdiagram.net/viewer.php?id=cqs1327471373e.png" rel="nofollow" target="_blank" title="Cricket Chirping Sound Generator"><img alt="Cricket Chirping Sound Generator" border="0" src="http://schematics.circuitdiagram.net/thumbs/cqs1327471373e.png" /></a></div>
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This is the circuit diagram of cricket chirping sound generator based on IC 4060, a 14 stage ripple counter and oscillator IC. A suitable audio wave form is produced by IC2 and related electronic components, driving the mini speaker through Q1. To allow a more real-life behavior, the chirp is interrupted in a pseudo-casual way by two timers built around IC1C and IC1D, whose outputs are mixed into IC1B and further time-delayed by IC1A, driving the reset pin of IC2.<br />
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An optional Photoresistor can be wired across this pin and positive supply, it is to make the <a href="http://circuitdiagram.net/" target="_blank">circuit</a> operates in the dark and stops when light is coming, thus imitating the cricket's behavior even more closely. R9 acts as volume control and can be a preset trimmer or a small potentiometer.<br />
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<b>Components List:</b><br />
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R1 = 330K 1/4W<br />
R2 = 220K 1/4W<br />
R3,R6 = 100K 1/4W<br />
R4 = Photo resistor (Optional, see text)<br />
R5,R7 = 22K 1/4W<br />
R8 = 10K 1/4W<br />
R9 = 470R 1/2W Trimmer Cermet or Carbon<br />
R10 = 22R 1/4W<br />
C1,C2,C3 = 47µF/25V<br />
C4 = 10µF/25V<br />
C5 = 1µF/50V<br />
C6 = 10nF/63V<br />
D1,D2,D3,D4 = 1N4148<br />
Q1 = BC547<br />
IC1 = 4093<br />
IC2 = 4060<br />
SPKR = 8 Ohm<br />
SW1 = SPST Toggle or Slide Switch<br />
B1 = 9V PP3 Battery (See Notes)<br />
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<b>Circuit Notes:</b><br />
<ul>
<li>The circuit can be powered by any battery or <a href="http://powersupplyadapter.blogspot.com/" target="_blank">power supply adapter</a> with 5 - 12V range.</li>
<li>For maximum performance results please use a loudspeaker as small as possible.</li>
<li>In some cases, the chirp can be improved further on by pressing the loudspeaker against a flat surface, for example. a wooden table.</li>
</ul>
Cricket chirping sound generator circuit project, page source: <a href="http://www.extremecircuits.net/2010/01/cricket-chirping-generator-circuit.html" rel="nofollow" target="_blank">extremecircuits.net</a>schematic diagramhttp://www.blogger.com/profile/10351645467260086674noreply@blogger.com0tag:blogger.com,1999:blog-30622371436056703.post-30002190249917306682012-01-21T03:47:00.000-08:002012-01-21T03:47:02.232-08:0019W Power Amplifier based LA4440<div style="text-align: center;">
<a href="http://schematics.circuitdiagram.net/viewer.php?id=bfi1327143616g.gif" rel="external nofollow" target="_blank" title="19W Power Amplifier based LA4440"><img alt="19W Power Amplifier based LA4440" border="0" src="http://schematics.circuitdiagram.net/thumbs/bfi1327143616g.gif" /></a></div>
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This is the 19W power amplifier circuit built based power IC LA4440. The LA4440 output configured in bridge connection. The LA4440 can be used for stereo amplifier and it will give power output of 6W on each channel. But if you use this power IC in bridge mode, the it will deliver power audio output up to 19W. Recommended supply voltage is 13.2V, 2A and heatsink should be mounted on the power IC.<br />
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<b>Power IC LA4440 Features:</b><br />
<ul>
<li>Built-in 2 channels (dual) enabling use in stereo and bridge amplifier applications.</li>
<ul>
<li>Dual : 6W´2 (typ.)</li>
<li>Bridge : 19W (typ.)</li>
</ul>
<li>Small pop noise at the time of <a href="http://powersupply88.com/" target="_blank">power supply</a> ON/OFF and good starting balance.</li>
<li>Minimum number of external parts required.</li>
<li>Good ripple rejection : 46dB (typ.)</li>
<li>Easy to design radiator fin.</li>
<li>Low distortion over a wide range from low frequencies to high frequencies.</li>
<li>Small residual noise (Rg=0).</li>
<li>Good channel separation.</li>
<li>Built-in protectors.</li>
<li>Built-in audio muting function.</li>
<ul>
<li>Overvoltage, surge voltage protector</li>
<li>Thermal protector</li>
<li>Pin-to-pin short protector</li>
</ul>
</ul>
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Download the database of <a href="http://downloads.circuitdiagram.net/dll/fxas5f" rel="nofollow" target="_blank" title="LA4440 database">LA4440</a>schematic diagramhttp://www.blogger.com/profile/10351645467260086674noreply@blogger.com0tag:blogger.com,1999:blog-30622371436056703.post-61498144463315023362012-01-13T15:41:00.000-08:002012-01-13T15:41:07.669-08:0015W Audio Amplifier with STK055<div style="text-align: center;">
<a href="http://schematics.circuitdiagram.net/viewer.php?id=arx1326497496g.gif" nofollow"="" rel-"external="" target="_blank" title="15W Audio Amplifier with STK055"><img alt="15W Audio Amplifier with STK055" border="0" src="http://schematics.circuitdiagram.net/thumbs/arx1326497496g.gif" /></a></div>
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Here the schematic diagram of 15W audio amplifier, built based on single power chip STK055 from Sanyo.The STK055 is old power amplifier chip which still available on the market because of the ease of its usage and the performance is good. This chip requires heatsink to be mounted on its body.<br />
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<b>Technical details:</b><br />
<ul>
<li>Maximum <a href="http://powersupply88.com/" target="_blank">power supply</a>: ± 28V</li>
<li>Recommended supply voltage: ± 20V</li>
<li>Power output: 15W</li>
<li>RL: 8 Ohm</li>
<li>TDH: 0.3%</li>
<li>Rin: 52K</li>
<li>Gain: 26.4 dB</li>
<li>Noise: 0.3mV</li>
</ul>
<br />schematic diagramhttp://www.blogger.com/profile/10351645467260086674noreply@blogger.com0tag:blogger.com,1999:blog-30622371436056703.post-8787786019645209392012-01-08T05:01:00.000-08:002012-01-08T05:01:08.381-08:00Mice Repellent Circuit<div style="text-align: center;"><a href="http://schematics.circuitdiagram.net/viewer.php?id=rgh1326019421q.jpg" rel="external nofollow" target="_blank" title="Rats Repeller schematic diagram"><img alt="Rats Repellent circuit diagram" border="0" src="http://schematics.circuitdiagram.net/thumbs/rgh1326019421q.jpg" /></a></div>This is the circuit diagram of mice repellent. Mice are animals that are very annoying, because sometimes he is damaging the object stored in the form of archives that are still valuable.<br />
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To drive out the mice, you can create an <a href="http://circuitdiagram.net/" target="_blank">electronic circuit</a> of mice repellent as shown above. With 50KHz frequency generated by the timer IC 555. The mice would run because his ears will feel sore due to the signal frequency.<br />
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The work of this circuit is very simple. The timer IC act as the frequency generator, while the frequency value is decided by C1 and C3. The output of 555 will be amplified by the SC1162 transistor and then fed to the speaker so the <a href="http://skema-elektronik.blogspot.com/search/label/audio">audio</a> signal can be heard by the mice.<br />
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<b>Parts List: </b><br />
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R1 = 1K8<br />
R2 = 1K<br />
R3 = 5K6<br />
R4 = 480R<br />
C1 = 2,2nF<br />
C2 = 0,022uF/6V<br />
IC = 555<br />
Q = SC1162<br />
SP = Speaker 4 ohmschematic diagramhttp://www.blogger.com/profile/10351645467260086674noreply@blogger.com0tag:blogger.com,1999:blog-30622371436056703.post-67911735659328441292012-01-02T14:55:00.000-08:002012-01-02T14:55:31.078-08:00Surround Sound Processor Circuit<div style="text-align: center;">
<a href="http://schematics.circuitdiagram.net/viewer.php?id=jdv1325543439r.png" rel="external nofollow" target="_blank" title="Surround Sound Processor Circuit diagram"><img alt="Surround Sound Processor Circuit diagram" border="0" src="http://schematics.circuitdiagram.net/thumbs/jdv1325543439r.png" /></a></div>
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This is the easy build surround sound processor circuit using the digital delay process method. This audio processor isn't applying any unique function ICs that tough to obtain parsonaly, and designed in only common purpose ICs.<br />
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The kind of this Surround Processor is producing the surround impact with processing two channels of stereo supply. The majority of those are generates the surround impact with separates reverberations from supply signal and applies any processes, after which mix it to front channels or output as rear channel.<br />
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The circuit works and contains three modules:<br />
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<b>Separating the Reverberatins</b><br />
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The distinction in between each channels is separated with distinction <a href="http://amplifier-circuit.blogspot.com/" target="_blank">amplifier</a> from the op-amp. And greater frequencies inside the distinction signal are cut using the LPF.<br />
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<b>A-D and D-A conversion</b><br />
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These are composed with common purpose ICs. The A-D converter is basically delta modurator that making use of a comparator plus a D type flip-flop. And it converts analog signal into digital data of one bit, 2 Msa/sec. Following passed digital delay, the bit stream is directly conversion into analog signal using the integrater.<br />
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It isn't beneficial that signal to noise ratio and distortion as this A-D, D-A converter.<br />
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<b>Digital Delay</b><br />
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For the digital delay method, a DRAM chip is utilised as a FIFO memory. This <a href="http://circuitdiagram.net/" target="_blank">circuit design</a> demands a 64K bit DRAM, but I utilized a 256K bit DRAM discovered within the junk box. Shift register generates Read-Modify-Write cycle, read out old data and save new data in a single cycle.<br />
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And lower byte in the address counter is assined as row address with the DRAM to increment row address every single cycle, to ensure that refresh cycle is often omitted. The FIFO length is 65536 bits and 2 Msa/sec makes 33 msec of delay time.<br />
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Surround sound processor circuit source page: http://elm-chan.org/works/srp/report_e.htmlschematic diagramhttp://www.blogger.com/profile/10351645467260086674noreply@blogger.com0tag:blogger.com,1999:blog-30622371436056703.post-2917083398498309092011-12-25T16:13:00.000-08:002011-12-25T16:13:04.393-08:00Mic Preamplifier Circuit based TLC251Here the <a href="http://skema-elektronik.blogspot.com/">schematic diagram</a> of mic preamplifier which build based on operational amplifier TC251. The TLC251 is operating in low bias. The circuit works with only 1.5 V supply draws electric current of only 10 mA, so the battery operation will be prefered. Circuit frequency response is 3dB, 27 Hz to 4.8 kHz.<br />
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<div style="text-align: center;">
<a href="http://schematics.circuitdiagram.net/viewer.php?id=rgh1324857129x.jpg" rel="external nofollow" target="_blank" title="Mic Preamplifier Circuit based TLC251 schematic diagram"><img alt="Mic Preamplifier Circuit based TLC251 circuit diagram" border="0" src="http://schematics.circuitdiagram.net/thumbs/rgh1324857129x.jpg" /></a></div>
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<b>Frequency Response:</b><br />
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<div style="text-align: center;">
<a href="http://schematics.circuitdiagram.net/viewer.php?id=opt1324857260z.jpg" rel="external nofollow" target="_blank" title="Frequency Response of Mic preamplifier circuit"><img alt="Frequency Response of Mic preamplifier circuit based TLC251" border="0" src="http://schematics.circuitdiagram.net/thumbs/opt1324857260z.jpg" /></a></div>
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The TLC251 are low-cost, low-power programmable operational amplifiers designed to operate with single or dual <a href="http://powersupply88.com/" target="_blank">power supplies</a>. Because the input common-mode range extends to the negative rail and the power consumption is very low, this chip is ideally suited for battery-powered or energy-conserving applications. A bias-select pin can be used to program one of three ac performance and power-dissipation levels to suit the application. The series features operation down to a 1.4V supply and is stable at unity gain.<br />
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Download the TLC251 datasheet document from the following link:<br />
» <a href="http://downloads.circuitdiagram.net/dll/h8i9pi" rel="external nofollow" target="_blank">Download link</a>schematic diagramhttp://www.blogger.com/profile/10351645467260086674noreply@blogger.com0tag:blogger.com,1999:blog-30622371436056703.post-69838927135230151222011-12-18T21:23:00.000-08:002011-12-19T00:02:56.218-08:00Stereo Tube Power Amplifier Schematic<div style="text-align: center;">
<a href="http://schematics.circuitdiagram.net/viewer.php?id=arx1324267587h.jpg" rel="external nofollow" target="_blank" title="Stereo Tube Power Amplifier Schematic schematic diagram"><img alt="Stereo Tube Power Amplifier Schematic circuit diagram" border="0" src="http://schematics.circuitdiagram.net/thumbs/arx1324267587h.jpg" /></a></div>
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This is the <a href="http://circuitdiagram.net/" target="_blank">circuit diagram</a> of stereo tube power amplifier. It applies 3 types of tube that are 2 6SF5 GT high-mu triodes, 1 5Y3 GT vacuum rectifier, and 2 6K6 power beam amplifiers. The Audio input can be from any two-channel line level device such as a television, CD player, or VCR. It is of the tube type, using only 5 tubes total with no more than about 45 Watts power consumption from the outlet. <br />
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<b>Components List:</b><br />
R1,R10,R13 = 2.2M Ohm Potensiometer<br />
R2 = 470K Ohm<br />
R3 = 1M Ohm<br />
R4 = 220K Ohm<br />
R5 = 330 Ohm 2W Resistor<br />
R6 = 220K Ohm<br />
R7 = 2.2M Ohm<br />
R8 = 1M Ohm<br />
R9 = 720 Ohm 20W Resistor<br />
R11 = 33K Ohm<br />
R12 = 22K Ohm<br />
C1,C9 = 4nF 400V Capacitor<br />
C2 = 50nF 600V Capacitor<br />
C3 = 20uF/25V<br />
C4 = 10nF 400V Capacitor<br />
C5 = 200pF 400V Ceramic Disc Capacitor<br />
C6,C7 = 15uF 450V Capacitor<br />
C8 = 15uF 400V Capacitor<br />
T1 = 117V Primary, 350VCT Secondary, 6.3V Secondary, 6.3V Secondary<br />
T2 = 7600 Ohm Primary, 4 or 8 Ohm Secondary<br />
SW1 = SPST Switch<br />
SP1,SP2 = 12" or smaller, 4 or 8 ohm speakers<br />
MISC = 5 tube sockets, 2 RCA jacks, PC board or chassis, wire, knobs, etc.<br />
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<b>Stereo Tube Power <a href="http://amplifiercircuit.net/" target="_blank">Amplifier Circuit</a> Notes:</b><br />
<ol>
<li>C8 is for radio interference suppression and may be omitted.</li>
<li>The 6V6 GT tube may be substituted for the 6K6 to lower power requirements.</li>
<li>The 5Y3 GT tube should be mounted in a vertical position and be well ventilated. The 6K6 and 6SF5 tubes can be mounted in any position.</li>
<li>The power supply portion of this unit may be used for anything requiring 290-320v DC up to about 3 amperes. </li>
<li>Controls should have an audio taper.</li>
</ol>
Circuit Source: http://english.cxem.net/amplifier/amplifier13.phpschematic diagramhttp://www.blogger.com/profile/10351645467260086674noreply@blogger.com0tag:blogger.com,1999:blog-30622371436056703.post-90918986907455559452011-11-22T23:30:00.001-08:002011-12-04T03:48:42.014-08:0012 LED VU Meter Circuit<div style="text-align: center;"><a href="http://schematics.circuitdiagram.net/viewer.php?id=arx1322033529j.gif" rel="external nofollow" target="_blank" title="12 LED VU Meter Circuit diagram"><img alt="12 LED VU Meter Circuit diagram" border="0" src="http://schematics.circuitdiagram.net/thumbs/arx1322033529j.gif" /></a></div><br />
Here the 12 LED VU meter circuit. This is a simple visual indication of the audio level signals, adaptive to various user needs. Can be adapted to different input levels, adjustable by trimmer TR1 (state) - TR2 (Gain), then rectified by diodes D1-D2 (standard negative mark-recovery periods) and driven in the main circuit indication, consisting of the diodes D3 up to D13, transistors Q2-Q13 and materials that exist around them. <br />
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The visual indicator is taken from the series of diodes LED LD1-13. Each Led illuminates when the level changed during about 0,65 V. The power requirements are 100 ma full term. We can add as many steps we want LED, always assuming the power where you need the new LED.<br />
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<b>Components List</b><br />
<table cellpadding="10"><tbody>
<tr><td>R1 = 47Kohm<br />
R2,3 = 1Mohm<br />
R4,R7 = 1Kohm<br />
R5 = 100ohm<br />
R6 = 18Kohm<br />
R9,11,13,15,17 = 560ohm<br />
R19,21,23,25,27 = 560ohm<br />
R29,31 = 560ohm<br />
R8,10,12,14 = 4.7Kohm<br />
R16,18,20,22 = 4.7Kohm<br />
R24,26,28,30 = 4.7Kohm <br />
C1 = 10uF/25V<br />
C2 = 100nF/100V MKT<br />
C3 = 4.7uF/25V</td><td>C4 = 4.7uF/25V<br />
C5 = 10uF/25V<br />
C6 = 47uF/25V<br />
C7-8 = 100nF/100V<br />
TR1 = 100Kohm Trimmer<br />
TR2 = 4.7Kohm Trimmer<br />
LD1 until LD7 = LED Green<br />
LD8,LD9,LD10 = LED Yellow<br />
LD11,LD12,LD13 = LED Red<br />
D1 until D13 = 1N4148<br />
Q1 until Q13 = BC550C - BC549B<br />
IC1 = TL071<br />
IC2 = 7812 [With Heatsink]<br />
All Resistors is 1/4W 1 -5%</td></tr>
</tbody></table><br />
12 LED VU Meter Circuit source page: <a href="http://users.otenet.gr/%7Eathsam/vu_meter_1.htm" rel="external nofollow" target="_blank">users.otenet.gr</a>schematic diagramhttp://www.blogger.com/profile/10351645467260086674noreply@blogger.com0tag:blogger.com,1999:blog-30622371436056703.post-78400036510578870512011-11-12T02:44:00.001-08:002011-11-12T03:42:44.284-08:002-Way Active Crossover Circuit<div style="text-align: center;">
<a href="http://schematics.circuitdiagram.net/viewer.php?id=arx1321094725q.jpg" rel="external nofollow" target="_blank" title="2-Way Active Crossover Circuit diagram"><img alt="2-Way Active Crossover Circuit diagram" border="0" src="http://schematics.circuitdiagram.net/thumbs/arx1321094725q.jpg" /></a></div>
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This is the <a href="http://skema-elektronik.blogspot.com/">schematic diagram</a> of 2-way active crossover circuit. The "active" word means that the circuit use active component and need power supply to work. Take a note that the input of this circuit is not connected to the output of power amplifier. This crossover circuit module must be placed before the <a href="http://amplifiercircuit.net/" target="_blank" title="amplifier circuit diagram">amplifier circuit</a>. The "Low Out" output connected to a power amplifier and the low speaker [Woofer], while the "High Out" output is drive the power amplifier of high speaker [Tweeter].<br />
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<br />
<blockquote class="tr_bq">
<b>Parts List</b><br />
<br />
R1 = 100Kohms<br />
R2,3,4,5,6 = 37.5ohms [33K+4.7K]<br />
R7 = 75Kohms[150K//150K<br />
R8 = N.C<br />
R9,10,11,12,13,14,15,16 = 10Kohms<br />
R17,18 = 47Kohms<br />
R19,20 = 47ohms<br />
C1 = 4.7uF/100V MKT<br />
C2,3,4,5,6,7,12,13 = 1nF 100V MKT<br />
C8,9,10,11,14,15 = 100nF 100V MKT<br />
C16 = 2.2uF/100V MKT<br />
C17 = 470nF 100V MKT<br />
C18,19 = 47uF/25V<br />
J1,2,3 = 2pin conn. 2.54mm pin step<br />
J4 = 3pin conn. 2.54mm pin step<br />
IC1,2,3 = NE5532 , TL072<br />
TR1 = 100Kohms trim. or pot.<br />
TR2,3 = 47Kohms trim. or pot.<br />
All the Resistors is 1,2% 1/4W metal film</blockquote>
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Circuit Source: <a href="http://users.otenet.gr/%7Eathsam/2way_active_crossover_with_linear_phase.htm" rel="external nofollow" target="_blank">2-Way Active Crossover Circuit with Linear Phase Response</a>schematic diagramhttp://www.blogger.com/profile/10351645467260086674noreply@blogger.com1tag:blogger.com,1999:blog-30622371436056703.post-81295795860685709502011-11-01T03:04:00.000-07:002011-11-12T03:21:40.080-08:00Home Telephone FM Transmitter Circuit<div style="text-align: center;">
<a href="http://schematics.circuitdiagram.net/viewer.php?id=bwy1320143190h.jpg" rel="external nofollow" target="_blank" title="Home Telephone FM Transmitter schematic diagram"><img alt="Home Telephone FM Transmitter circuit diagram" border="0" src="http://schematics.circuitdiagram.net/thumbs/bwy1320143190h.jpg" /></a></div>
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Here the schematic diagram of home telephone FM transmitter. This circuit connects in series with your home phone line and delivers the phone conversation through the FM band any time you pick up the telephone handset. Transmitted signal could be tuned by any FM receiver. The <a href="http://circuitdiagram.net/" target="_blank" title="circuit diagram">circuit</a> features an "On Air" LED indicator and also gives you a switch that can be utilized to turn off the transmitter. A special characteristic of the circuit is the fact that no battery is required to operate the circuit because electrical power is taken from your phone line.<br />
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The transmitter circuit works by using only a short piece of wire aerial about 4" / 10 cm long to transmit the signal and a portion of the RF signal can also be radiated via the phone line itself. The circuit may possibly be implemented to share or record conversations, but will not be meant for illegal use.<br />
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Source: <a href="http://electronics-diy.com/electronic_schematic.php?id=840" rel="external nofollow" target="_blank" title="Home Telephone FM Transmitter Circuit">Home Telephone FM Transmitter Circuit</a>schematic diagramhttp://www.blogger.com/profile/10351645467260086674noreply@blogger.com0tag:blogger.com,1999:blog-30622371436056703.post-38259153039249324512011-10-26T04:39:00.000-07:002011-11-12T03:21:45.748-08:00Stereo PLL FM Transmitter based BH1417<div style="text-align: center;">
<a href="http://schematics.circuitdiagram.net/viewer.php?id=klz1319633185w.jpg" rel="external nofollow" target="_blank" title="Stereo PLL FM Transmitter based BH1417"><img alt="Stereo PLL FM Transmitter based BH1417" border="0" src="http://schematics.circuitdiagram.net/thumbs/klz1319633185w.jpg" /></a></div>
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Here the circuit diagram of stereo PLL FM transmitter based BH1417 chip. This is certainly the most recent BH1417 FM Transmitter design diagram from RHOM that consists of lots of capabilities in a single tiny package. It includes pre-emphasis, limiter to ensure that the music can be transmitted at the same <a href="http://audio-circuits.blogspot.com/" target="_blank" title="audio circuit diagram">audio</a> level, stereo encoder for stereo transmission, low pass filter that blocks any audio signals above 15KHz to avoid any RF interference, PLL circuit that delivers rock solid frequency transmission (no extra frequency drift), FM oscillator and RF output buffer.<br />
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There is certainly 14 possible transmission frequencies with 200KHz increments that you can select using a 4-DIP switch. Lower band frequencies begin from 88.7 up to 89.9 MHz, and upper band frequencies begin from 107.7 up to 108.9 MHz.<br />
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BH1417 could be supplied with 4 - 6 voltage and needs only about 30mA, giving 20mW output RF power. BH1417 delivers 40dB channel separation that is fairly good, although older BA1404 FM Transmitter chip delivers slightly better 45dB channel separation.<br />
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BH1417 is only offered in SOP22 IC case so this may possibly be an inconvenience for some people. On the other hand, since the chip is smaller than common DIP-based ICs it's possible to fit the whole transmitter on a compact PCB.<br />
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BH1417 chip may possibly also be applied a stand alone stereo encoder. The benefit of that's that you have full freedom of working with a transmitter and <a href="http://amplifiercircuit.net/" target="_blank" title="amplifier circuit">amplifier</a> of your choice. You will still have a pre-emphasis, limiter, stereo encoder and low pass filter in a single tiny package since very few external components are required for these blocks. PIN 5 is MPX output that could be directly connected to an external FM transmitter through a 10uF capacitor.<br />
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Detailed information about this circuit, visit: http://electronics-diy.com/BH1417_PLL_Stereo_FM_Transmitter.php . The kit of stereo PLL FM transmitter based BH1417 also available there.schematic diagramhttp://www.blogger.com/profile/10351645467260086674noreply@blogger.com0