Stereo FM Transmitter 88-108 MHz based BA1404

This is the stereo FM transmitter schematic diagram which built based BA1404. By using this HI-FI stereo FM transmitter, you will be able to transmit MP3 music from your iPod, computer, discman, walkman, TV / SAT receiver, and many other audio sources.

The transmitter can work from a single 1.5V cell battery and provide excellent crystal clear stereo sound. It can also be supplied from two 1.5V battery cells to provide the maximum range.

The kits of Stereo FM Transmitter 88-108 MHz based BA1404 available at electronics-diy.com, check it out

Offline Switching Power Supply Circuit (5V - 10A - 50W)

Here the schematic diagram of offline switching power supply:

Circuit Diagram:

Parts List:

This switching power supply is using a MOSFET. For 220V AC voltage input, use BUZ80A/IXTP4N8 MOSFET and for 110V AC input voltage, use GE IRF823 MOSFET. The output will be 5 Volt DC with electric current can be reach 10A.

Echo Chamber Schematic

The following diagram is the schematic diagram of echo chamber circuit which will convert the sound of input to have echo sound like repeating sound if you talking in a cave. It will smoothing your sound also.

The circuit based 4 main ICs that are a MN3005, a MN3101, and 4 pieces of AN6551. I've made this kind of circuit, it's working great and you don't have to spend a lot of cost. :)

Clock Generator Circuit

This is the circuit diagram of Clock Generator circuit based NAND logic gate. You can use 4011 for CMOS IC and 7400 for TTL IC.

Circuit Notes:

• Excellent clock generator to drive 4017 type CMOS circuits.
• Fo is ±1Kz when R1=100K and C1=10nF.
• R1 = 10K to 10M, C1 = 100pF to 47uF.
• Input voltage can be from 5 to 15V.

Sample IC CMOS NAND gate 4011 pinout:

Basic Motorcycle Alarm circuit

This is a very basic motorcycle alarm design circuit which can be used to secure your motorcycle with very low in cost.

Design schematic:

Circuit Number Five uses a SPCO/SPDT relay - but you actually only require to make use of a SPST relay. In case you are going to make use of the veroboard layout supplied - you will require to make use of the style of relay specified. But you are able to develop the alarm making use of whatever style of relay you've accessible.

Circuit Notes:
Any number of normally-open switches might be employed. Fit the mercury switches to ensure that they close when the steering is moved or when the bike is lifted off its side-stand or pushed forward off its centre-stand. Use micro-switches to secure removable panels and also the lids of panniers and so on. When 1 of the trigger-switches is closed - the relay will energize as well as the siren will sound.

You are able to select what will happen up coming. Should you develop the circuit as shown, the siren will continue to sound until you turn it off - or until the battery is exhausted. But, in the event you leave out D3 - the siren will stop sounding right away the trigger-switch is re-opened.

Whilst you are inside earshot of your machine - the former configuration is greatest. You are able to usually turn off the alarm your self. But in case you are going to be away from your bike for any length of time - and you do not wish to trigger a nuisance - then the latter configuration is possibly much more suitable. In the event you consist of a SPST switch in series with D3 - you'll be able to pick the behaviour that finest suits the circumstances at any given time.

Components placement:

Relay coils and some sounders generate high reverse-voltage spikes which will destroy sensitive electronic components. D1 and D2 are there to short-circuit these spikes just before they are able to do any harm. Even though there's absolutely nothing within the alarm circuit itself that might be damaged - I've no concept what other electronic equipment may be connected to the exact same power supply. So I included the two diodes as a precaution. If you are satisfied that there is absolutely nothing on your bike that may be damaged in this way - you'll be able to leave out the two diodes.

Basic Motorcycle Alarm circuit source: zen22142.zen.co.uk

Simple Servo Motor Controller circuit

The following is the schematic diagram of simple servo motor controller circuit.

Simple Servo Motor Controller Parts List:

R1 = 820 Ohm 1/4W
R2 = 68K 1/4W
R3 = 10K 1/4W
R4 = 1K 1/4W
R5 = 1K Linear Taper Pot
C1 = 1uF/16V
Q1 = 2N3904 / 2N2222
U1 = 555 Timer IC
MISC = Board, Wire, Knob For R1, 8 Pin Socket For U1

The servo motor have many utilizes in everything from robotics to puppetry to photography and beyond. These tiny motors can position their output shaft to any position on command and hold that position. Most servos possess a range of motion to about 210 degrees and thankfully are quite easy to handle with a basic circuit like the one presented right here. Working with just a 555 timer as well as a couple of support parts, this circuit can handle a servo via it is full rotation primarily based on the position of a potentiometer.

Passive Surround Audio Circuit

This is a passive surround audio circuit for better audio environment for your home audio system. The schematic diagram is very simple, it just need the combination of resistors and electrolytic capacitors.

Passive Surround Audio Circuit Notes:

• The rear speakers must be full range type of speaker. Do not use woofer or tweeter speakers for rear speakers, you'll bad audio environment.
• 5W resistors is a must, the 1/4 or 1/2 watt resistor will burned.

Source: Passive audio surround