Inductive anti-theft alarm circuit diagram

Published:2011/6/14 5:06:00 Author:Lucas | Keyword: Inductive, anti-theft alarm | From:SeekIC

The circuit is shown as the chart. The voltage on R3 is higher to stop the multiple valve composed of V4 and V2 and conduct V2, and it cuts off the four tones analog integrated circuit, and the speaker does not sound. When someone closes to the sensor, the value of C0 increases and the high-frequency differential pressure decreases. The voltage sent to the base of V1 by C3 can not maintain the oscillation of V1 and V1 stops vibration immediately. At this point the voltage on R3 becomes smaller, and V2 stops, then V3, V4 conduct and the pin ② of IC gets power and works.Pin ③ emits siren signal which is amplified by the V5 and output from the loudspeaker, and it will emit warning sound.



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