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High sensitivity acoustic vibration alarm circuit
Source: InternetPublisher:常思一二 Keywords: Alarm circuit field effect tube delay circuit Updated: 2021/11/04
Circuit working principle: In the circuit, HTD and field effect transistor VT form an acoustic vibration sensing
receiving and high-sensitivity amplification circuit, and Rp is the sensitivity adjustment potentiometer. lC1, R4, and
C3 constitute a monostable delay circuit , and its delay t=1.1R3·C4≈2min. IC2, R5,
R6, and C4 constitute an audio oscillator.
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