Here’s A Simple Do-It-Yourself (DIY) FM Transmitter Kit. You Can Use This Simple DIY Kit To Transmit Your Voice Or Audio To Your Nearest FM Radio.
You can use this FM transmitter/microphone in two ways:
b. Audio transmission connecting speaker stereo jack to audio source: For hearing a better sound, you may connect it to your computer, iPod or mp3 player using a speaker jack. The audio of your music players gets transmitted to your nearby radio.
It comes as a pack of parts kit and can be easily assembled if you can follow the silkscreen indicators (labels) and have beginning experience with a soldering iron. You will need to read the resistor bands or use a multimeter to determine the resistor sizes. The kit operates with a 3-9V power supply.
- Frequency Range: 88-108MHZ (Frequency can be changed by moving the adjustable inductor coil).
- Operating voltage: 3V-9V.
- Transmission range: The transmission range depends upon the length of the antenna used. We send a simple 20cm long wire that should transmit signals around 10m inside your room. The signal can be transmitted ever far with a longer antenna of length around 50cm. It can transmit up to 100m in open space.
- Electret microphone.
- Transistor (Q1)- S9018.
- R1- 2.2K
- R2- 22K
- R3- 2.2K
- R4- 33 Ohm
- R5- 33 Ohm
- C1- 0.1uF(Code- 104). Read here how to interpret capacitor code.
- C2- 0.1uF (Code- 104)
- C3- 680pF(Code- 681)
- C4- 30pF(Code- 30). This capacitor contributes to the FM transmission frequency.
- C5- 10pF(Code- 10)
- C6- 30pF(Code- 30). Coupling capacitor connected to the antenna of the kit.
- C7- 30pF(Code- 30)
- C8- 0.1uF(Code- 104)
- Inductor(L)- 0.1uH (5.5Turns coil). This contributes to the FM transmission frequency.
- Antenna- A short wire, 20cm long.
- 9V battery connector and 2pcs wires (can be any color)
- Stereo speaker jack
- Manual – sent with the package: About FM transmitter DIY Learning Kit for Beginners