FM wireless microphone, powered by a single 2032 battery, Q1 audio amplification, Q2 realizes oscillation and modulation. Q2 works in multiple configurations. For audio, it is a common collector; for radio frequency, it is a common-base three-point oscillator. The Cce capacitance of Q2 changes with the audio signal to achieve FM modulation. The operating frequency is about 100MHz, all pin components are used, and no basic soldering skills are required. It is suitable for extracurricular activities of primary and secondary school students.
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