[Photo] Micro FM wireless microphone

The circuit uses a capacitive three-point oscillator, simple and reliable, and easy to start. BG2 BG1 to the amplifying circuit composed of the weak sound signal from the detected small condenser microphone is amplified, the amplitude of a certain composition of a capacitive three-point oscillator BG2 generated carrier signal is modulated final output from the antenna. The circuit adopts diode voltage stabilization technology, which can make the circuit work more stably. The circuit is as follows:

Component selection:

Text box: BG1 uses 2SC9014 equivalent power transistor. BG2 selection transistor 2SC9018 high frequency high power requirements β≥ 100, the amplification factor too prone to instability, low vibration control circuit will not help. MIC selects miniature ultra-thin condenser microphone. L1 is obtained by making Φ 51mm high-strength enameled wire 8 rounds on the ball-point pen core , and it resonates in parallel with C4 and around 100MHZ . The antenna is about 80mm long with a flexible cord .

The whole circuit can be made on a circuit board with a size of about 3 × 2mm . A normal FM radio outside 100M should be able to clearly monitor the slight sound within 5M around the microphone.

In order to work stably for a long time, the circuit uses 3V battery power supply, the current consumption of the whole machine is 8-10MA.

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