Crystal FM Transmitter | One Transistor FM Transmitter | Frequency Harmonics |

In this week's episode, we show how to make an FM transmitter from a Single Transistor and a Crystal. This was a modification of an amplifier circuit with an NPN transistor and LM 386 IC.

We also discussed RF Fundamental and Harmonic Frequencies and how and why we are able to use low frequency Crystal (up to 27MHz) for FM band broadcast in bands from 88 to 108 MHz.

The transistor is 2N2222. The power supply is from 3V to 4.5V.

NB. Please, notice the short circuit on the crystal. It is supposed to be connected across the 56K resistor.