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High sensitivity anti-theft alarm circuit with high loudness

2015-03-03 18:43  
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High sensitivity anti-theft alarm circuit with high loudness
The SCR, R2 and L form a triggered power switch with controllable disconnection, L is an anti-theft wire. Transistor VT and IC1 form approximately 2min monostable delay trigger circuit. IC2 is the language alarm circuit which can emit the sound of catch thief, please . Usually when K is closed, if there is no thief, the alarm burglar lines will make SCR control gate trigger current be short, SCR is off, the circuit does not work, and it is in the probation status. If thied jumps over the wall of park, the wire L is pulled and disconnected, SCR control pole gets triggered current by R2, then it is be turned on to provide the power for working circuit.