The car sound burglarproof alarm (1)

Published:2011/7/23 2:51:00 Author:qqtang | Keyword: burglarproof alarm | From:SeekIC

The working principle of the circuit The car sound burglarproof alarm consists of the photoelectric detection control circuit, self-detection circuit, low-frequency oscillator circuit and alarm circuit, see as figure 7-10. The photoelectric detection control circuit consists of the photocoupler VLC, resistors of R1 and R3, the D1 inside the 4 NAND integrated circuits IC(Dl-D4). The self-detection circuit consists of the resistors of R2 and R4-R7, D4 inside IC, capacitor C1, transistor V1, LED VL and buzzer HA1.



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