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The car sound burglarproof alarm (2)

2017-01-18 06:16  
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The car sound burglarproof alarm (2)
The working principle of the circuitThe car sound burglarproof alarm consists of the trigger control circuit and alarm circuit, see as figure 7-102. The trigger control circuit consists of the time-based integrated circuits of IC1 and IC2, resistors R1-R5 and capacitors of C1 and C2.The alarm circuit consists of the time based integrated circuit IC3, resistors of R6 and R7, capacitor VD, relay K and the flash HL on the car, loudspeaker HA and so on.