4 Transistor Transmitter
Circuit Notes:
This circuit provides an FM modulated signal with an output power of around 500mW. The input
Mic preamp is built around a couple of 2N3904 transistors, audio gain limited by the 5k preset.
The oscillator is a colpitts stage, frequency of oscillation governed by the tank circuit made from
two 5pF capacitors and the inductor. ( Click here for
Colpitt Oscillator Resonant Frequency Equation
Frequency is around 100Mhz with values shown.
Audio modulation is fed into the tank circuit via the 5p capacitor, the 10k resistor and 1N4002
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