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

Function Generator Sine / Triangle / Square / Saw ( PIC16F870 )
5V 0.5A power supply
LM12 - High Power Amplifier circuit Schematic Diagram
light dimmer circuit
Road remote control switch production
10 Amp 13 8 Volt Power Supply
electronics and communication projects
Video-Out Coupling
Adding 1 PPS and 10MHz Outputs to the Z3801A
96 ford explorer: My headlights do not work interior lights
introduction to controlled rectifiers with converter



Top