FM radio microphone with a power amplifier. It's built with two transistors. The oscillator is mounted on the left transistor, and the power amplifier is on the right. The operating range is approximately 100-150 meters. You can build a radio microphone with a single transistor without a power amplifier; it will still work, but if you connect a 50-ohm load, the signal will be distorted. Therefore, to avoid signal distortion and increase the radio microphone's range, a power amplifier is needed. With one, the signal will be uncorrupted.
L1 contains 7 turns of 0.18mm diameter wire wound on a 5mm diameter mandrel with a ferrite core. This coil is used to tune the desired frequency (78-84 MHz) and the maximum signal.
L2 and L3 contain 8 turns of 0.4mm diameter wire wound on a 3mm diameter mandrel.
L4 contains 5 turns of 0.4mm diameter wire wound on a 3mm diameter mandrel.
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