Oscillation and impact acousto-optic alarm circuit diagram

Published:2011/6/23 21:25:00 Author:Nicole | Keyword: Oscillation, impact, acousto-optic alarm | From:SeekIC

The sensor is composed of tinned gold ball which is hung on gold spring wire and small gold box, the ball is hung on the center of the box, it has 1~2mm gap, it can not be touched in the condition of state, namely, the electricity is isolated, the ball is connected to power supply VDD, the box is connected to R1 and VT1. When it has impact or oscillation, the ball will thrill or shake, and it is connected to the gold, VT1 obtains positive bias and turns on. Due to C2 charging capacitor is connected, even slight impact or oscillation, VT1 also can keep constant turn-on, then IC1, IC2 will obtain ground loop, VT1's saturated voltage drop is not higher than 0.4V. IC1 adopts time base circuit 555, the low frequency multivibrator is made of IC1 and R2, R3, R4, the oscillation frequency is fc=1.44/(R2+2R3)C3.



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