January 09, 2025

High sensitivity vibration alarm circuit diagram

Crystal oscillator
Quartz Oscillator 3225 20M OSC


Circuit working principle: In the circuit, HTD and FET VT constitute acoustic vibration sensing receiving and high sensitivity amplification circuit, Rp is sensitivity adjustment potentiometer. lC1, R4, C3 form a monostable delay circuit with a delay of t=1.1R3·C4≈2min. IC2, R5, R6, and C4 form an audio oscillator.

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