1.5V mini wireless FM microphone circuit diagram:
This article uses 12 components to make a miniature wireless FM microphone, the working frequency is stable, the transmission distance is about 30 meters, and it can reach more than 100 meters when powered by 6V.
The circuit is shown in the figure, BG1 and C1, C3 form a high-frequency oscillation circuit. The launch distance is related to the working current of the launch tube. The bias resistor R2 can change the output current of BG1.
When choosing BG1, the fT of the tube must be greater than 300MHz, but too high fT will affect the modulation. The inductance L is divided into two coils to be wound, but the winding direction must be the same. L1 uses a 0.5mm diameter enameled wire to wrap 4 turns on the 5mm diameter skeleton , L2 turns 3 turns. The antenna can use a 0.6 meter long flexible wire.
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