simple steps for making fm transmitter


Posted on Feb 6, 2014

This tutorial is for making simplest FM transmitter using one transistor. You can make this project with less components and it is an easy and simple project for beginners. Before you proceed, please see the schematic given below. In the schematic, you will see the components required for making an FM transmitter. The transmission range of this cir


simple steps for making fm transmitter
Click here to download the full size of the above Circuit.

cuit is approximately 10-20 meters. 3. Variable capacitor: VC1. It is also called trimmer capacitor. You can buy one from your local store. The capacitance range should be 0-100pF or 10-100pF. If you cannot get one, try to get a trimmer capacitor that has minimum capacitance of 20pF. You can also get such capacitor from your broken radio, but you may need assistance in getting that out from your radio. On your electret microphone, you will see that on one of the pins, there is solder pad connected to the case of microphone. Remember that pin is always negative. On the image shown below, you can notice that I have not used a trimmer/variable capacitor. I have used a fixed 20pF capacitor instead. So, if you don`t have a variable capacitor, you can use a fixed capacitor also. Then, with a non-conductive tool, adjust the capacitor for the clearest reception, rotate it till the receiver receives a sound from the microphone of transmitter. Use the following formula for determining the frequency.




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