This amplifier comes with high fidelity (Hi-Fi), high sensitivity, low power consumption and low distortion. It will be nice for your high fidelity sound system. :)
Follow the instruction here
100W Audio Amplifier
This amplifier comes with high fidelity (Hi-Fi), high sensitivity, low power consumption and low distortion. It will be nice for your high fidelity sound system. :)
Follow the instruction here
Dancing LEDs
This is dancing LEDs schematic diagram. the LEDs will dance squence to audio (music or speaking) from the microphone.
Components list:
R1_____________10K 1/4W Resistor
R2,R3__________47K 1/4W Resistors
R4______________1K 1/4W Resistor
R5,R6,R7______100K 1/4W Resistors
R8____________820R 1/4W Resistor
C1,C3_________100nF 63V Ceramic or Polyester Capacitors
C2_____________10΅F 50V Electrolytic Capacitor
C4____________330nF 63V Polyester Capacitor (See Notes)
C5____________100΅F 25V Electrolytic Capacitor
D1___________1N4148 75V 150mA Diode
D2-D11_________5 or 3mm. LEDs (any type and color)
IC1___________LM358 Low Power Dual Op-amp
IC2____________4017 Decade counter with 10 decoded outputs IC
M1_____________Miniature electret microphone
SW1____________SPST miniature Slider Switch
B1_______________9V PP3 Battery
Clip for PP3 Battery
Additional circuit parts (see Notes):
R9,R10_________10K 1/4W Resistors
R11____________56R 1/4W Resistor
D12,D13 etc.____5 or 3mm. LEDs (any type and color)
Q1,Q2_________BC327 45V 800mA PNP Transistors
Q3____________BC337 45V 800mA NPN Transistor
Circuit operation:
IC1A amplifies about 100 times the audio signal picked-up by the microphone and drives IC1B acting as peak-voltage detector. Its output peaks are synchronous with the peaks of the input signal and clock IC2, a ring decade counter capable of driving up to ten LEDs in sequence.
An additional circuit allows the driving of up to ten strips, made up by five LEDs each (max.), at 9V supply. It is formed by a 10mA constant current source (Q1 & Q2) common to all LED strips and by a switching transistor (Q3), driving a strip obtained from 2 to 5 series-connected LEDs. Therefore one transistor and its Base resistor are required to drive each strip used.
Notes:
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The sensitivity of the circuit can be varied changing R4 value.
- C4 value can be varied from 220 to 470nF in order to change the circuit speed-response to music peaks.
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Adopting the additional circuit, only one item for R10, R11, Q1 and Q2 is required to drive up to ten LED strips. On the contrary, one item of R9 and Q3 is necessary to drive each strip you decided to use.
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Each R9 input must be connected to IC2 output pins, in place of the LEDs D2-D11 shown. R8 must also be omitted.
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Whishing to use a lower number of LEDs or LED strips, pin #15 of IC2 must be disconnected from ground and connected to the first unused output pin. Example:
if you decided to use 5 LEDs, pin #15 of IC2 must be connected to pin #1; if you decided to use 8 LEDs, pin #15 of IC2 must be connected to pin #9 etc. -
Current drawing of the circuit is about 10mA.
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Whishing to use a wall-plug transformer-supply instead of a 9V battery, you can supply the circuit at 12V, allowing the use of up to 6 LEDs per strip, or at 15V, allowing the use of up to 7 LEDs per strip.
500W Inverter 12V DC to 220V AC
This is inexpensive inverter circuit which able to convert 12V DC become 220V AC. IC CD4047 is use to generate the square wave of 50hz and amplify the current and then amplify the voltage by using the step transformer.
How to calculate transformer rating
How to calculate transformer rating
The basic formula is P=VI and between input output of the transformer we have Power input = Power output
For example if we want a 220W output at 220V then we need 1A at the output. Then at the input we must have at least 18.3V at 12V because: 12V*18.3 = 220v*1
So you have to wind the step up transformer 12v to 220v but input winding must be capable to bear 20A.
60 Watt Amplifier using TDA2052
This is HiFi audio amplifier system. This amplifier is AB class amplifier and has very low distortion that's why this amplifier can be used for HiFi audio system. TDA2052 has mute and st-by functions so it can be controlled by external digital circuits. Very high temperature and output short circuit protections are included. You should use a heatsink to dissipate the excess heat.
Functions of the Components:
- R1 - Input Impedance
- R2,R3 - Gain (32dB)
- R4 - Input Impedance in Mute Mode
- R5 - Standby Transition Time
- R8 - Output Frequency Balancing
- R9,R10 - Discharge Resistors
- C1 - Input Coupling Capacitor
- C3 - Feedback Coupling Capacitor
- C4 - Standby Transition Time
- C5 - Output Frequency Balancing
- C6,C7 - Supply Stabilizing Capacitors
- C9,C10 - Supply Filter Capacitors
Component List:
| Component | Value | Number |
| R1,R2,R4,R5 | 11k ¼ W | 4 |
| R3 | 560, ¼ W | 1 |
| R6 | 7.5 K, ¼ W | 1 |
| R7 | 1 K, ¼ W | 1 |
| R8 | 4.7 , ¼ W | 1 |
| R9,R10 | 1.2 K, ¼ W | 2 |
| C1 | 2 uF/25 V | 1 |
| C3,C4 | 10 uF/25 V | 2 |
| C5,C9,C10 | 100 nF | 3 |
| C6,C7 | 1000 uF/40 V | 1 |
| U1 | TDA2052 | 1 |
1.5 Watt FM Transmitter
This is the the schematic diagram of 15 watt FM transmiter. The range should be 1-2Km with normal FM receiver.
Components List:
| R1 | 220K |
| R2 | 4.7K |
| R3,R4 | 10K |
| R5 | 100ohm |
| C1,C2 | 4.7uF electrolytic |
| C3,C4 | 1nF |
| C5 | 2-15pF |
| C6 | 3.3pF |
| Q1 | BC547C |
| Q2 | 2N2219A |
| P1 | 25K |
| MIC | ecm series |
60W Power Audio Amplifier with 2N3055
This circuit is simple and inexpensive:
This is a class B amplifier, this means, that a current must flow through the end transistors, even if there is no signal on the input. This current can be regulated with the 500Ω trimmer resistor. As this current incrases, the sound of the amplifier gets better, but the end transistors are more heating. But if this current decrases, the transistors are not heating so much, but the sound gets worse.
you can download the document version here
This is a class B amplifier, this means, that a current must flow through the end transistors, even if there is no signal on the input. This current can be regulated with the 500Ω trimmer resistor. As this current incrases, the sound of the amplifier gets better, but the end transistors are more heating. But if this current decrases, the transistors are not heating so much, but the sound gets worse.
you can download the document version here
Infrared Modulation Identifier
This is the schematic of Infrared Modulation Identifier Via Remote Control.
The circuit illustrates how the modulated carrier of infrared is measured by displaying the waveform on a frequency counter after the signal received is amplified.
More explanation, visit this page.
More explanation, visit this page.
10 Band Graphic Equalizer
This equalizer build based on TL074 low noise JFET op-amp which will give you high quality audio output.
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Multi Channel Audio Mixer using JFET 2N3819
This is multi channel audio mixer using main component JFET 2N3819. You can add the input as many as you need for your project.
2N3819 is an n-channel JFET especially manufactured for RF and mixer applications and provides very low noise, very low distortion and excellent high frequency gain.
Dual Regulated Power Supply
You need center tap transformer. for example, if you need 12v output, you should connect J1 to 15v transformer output, J2 connected to 0v and J3 connected to another 15V.
Electronic Fuse for DC Short Circuit Protection
This circuit will protect your power supply or battery. The electric current will stopped by relay when electric current short occured, Relays must be chosen with a voltage value equals to the input voltage. Don't omit using the 100uF capacitor with appropriate voltage value with respect to the input voltage. If you can't provide, you can use C106 instead of BRX46.
You can adjust the current with using 10K potentiometer. If you will use the fuse with very high currents, lower the 0R6 5W resistor value (ex. 0R47, 0R33, 0R22 or 0R1). Watt value of the resistor should be increased also.