FM Transmitter (2N2222)


Posted on Apr 4, 2012

This circuit is a simple two transistor (2N2222) FM transmitter. No license is required for this transmitter according to FCC regulations regarding wireless microphones. If powered by a 9 volt battery and used with an antenna no longer than 12 inches, the transmitter will be within the FCC limits. The microphone is amplified by Q1. Q2, C5, and L1 form an oscillator that operates in the 80 to 130 MHz range.


FM Transmitter (2N2222)
Click here to download the full size of the above Circuit.

The oscillator is voltage controlled, so it is modulated by the audio signal that is applied to the base of Q2. R6 limits the input to the RF section, and it's value can be adjusted as necessary to limit the volume of the input. L1 and C6 can be made with




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Transceiver for 20 m band
220V 200W Bulb flasher
adjustable current limit for dual power
Dr. Iguanas Vivarium
10 STEP SEQUENCER
OP27 Fixed Gain Transformerless Microphone Preamplifier
Transistor Tutorial MOSFETs



Top