The location is good, the listening is very clear, but the anti-interference ability is not very good.
The wireless microphone I made
DIY PIC
Very simple, there are not a few components. It's just that it's more strenuous when debugging the frequency. Because the frequency range of the FM radio is very narrow, 88Mhz~108MHz, I have calculated the frequency of the LC many times with paper, the length of the coil, the cross-sectional area, the diameter of the wire, the inductance and the transmission frequency.
The location is good, the listening is very clear, but the anti-interference ability is not very good. The sensitivity of MIC is very high, and the transmission distance should be within 10 meters.
