The inductance burglarproof alarm circuit

Published:2011/7/6 22:18:00 Author:qqtang | Keyword: inductance, burglarproof alarm | From:SeekIC

Whether the thief is wearing a glove or not, as long as the hand is within 5~80mm away from the alarm inductor, the alarm will make sound. See as the figure. The inductor is represented with G, and there is a distributing capacitor between G and the ground, Co, L, C1 and V1 compose the 3-pole oscillator, in the circuit composed of Co, C1 and L, judging from the AC circuit, Co is serially connected with C1. When there is no one getting close to G, Co is low, when it is serially connected with C1, the voltage on the two terminals is high.



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