[Photo] Wireless microphone

A few days ago, the price of a wireless microphone on the market was between 10 and 20 yuan. The microphone is tuned in the 88-108MHz FM band, with a transmission distance of about 30 meters, and can be received by any FM radio. The received sound is clear and pleasing, without clutter interference, and has no effect on local FM radio stations. I have drawn its circuit diagram based on the actual product of this machine for the reference of electronic enthusiasts.

Circuit working principle. The sound is coupled to the base of the triode through the microphone via R1 and C1; the high and low frequency resistance-capacitance filters formed by R2 and C2. Due to the positive feedback amplification of the transistor, the high-frequency signal of the high-frequency oscillator composed of L1 and C3 is equivalently fed back to the base of the transistor through C4. The two signals are mixed together by a triode to form a high-frequency FM carrier (88-108MHz), which is transmitted to the antenna via C6, and the antenna transmits FM signals to the surrounding space.

Fine-tuning the gap of the L1 coil can change the frequency value of the FM FM wave. When in use, the receiving frequency point of FM can be arbitrarily selected from 88 to 108MHz.

Selection of component L1. Use âˆ®0.6mm enameled wire to wind 4 times on the center of the ordinary ballpoint pen. Transistor uses C201818 high-frequency small power tube. Other components can be identified according to the parameters in the figure.

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