High-fidelity AM wireless microphone circuit
Source: InternetPublisher:萌面大虾 Keywords: wireless microphone high fidelity Updated: 2021/08/29
Working principle of the circuit: The circuit uses the integrated circuit LM389 as the core component. The voice signal
is obtained by the microphone MIC and converted into an electrical signal . After amplification , it is coupled to the base of VT3 in the
differential current source circuit through the volume control potentiometers Rp2 and C5 . VT1 and VT2 together
form a radio frequency oscillator, L and C6 are parallel high-frequency oscillation tuning circuits, and C2 is an oscillation feedback
capacitor.
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