The bicycle burglarproof alarm (1)

Published:2011/7/22 21:56:00 Author:qqtang | Keyword: burglarproof alarm | From:SeekIC

The working principle of the circuit The bicycle burglarproof alarm consists of the trigger control circuit and voice alarm circuit, see as figure 7-109. The trigger control circuit consists of the sensor SQ, diodes VDl-VD4, resistors Rl-R6, capacitors of C1, C2, C4, NAND integrated circuit ICl(Dl-D4) and so on. The sound alarm circuit consists of the sound integrated circuit IC2, transistors V1 and V2, resistors R7-R8, capacitor C5, output transformer T and loudspeaker BL.



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