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Auto Flash Alarm

2017-02-01 13:52  
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Auto Flash Alarm
Work of the circuit The circuit consists of low-frequency oscillator, the electronic switch circuit, control circuit, photoelectric display circuit and music alarm circuit. (It is showed in picture 7-113.) Low-frequency oscillator consists of IC lCl (Dl-D4) internal NAND gate circuit D3, D4 and external RC components. Control circuit consists of ICl internal non-gate Dl and D2. It is used to control high-power electronic switch IC lC2. Photoelectric display circuit consists of diode VDl-VD6, LED VLl-VL3 (installed in the steering switch) and the resistors R3-R5. Music alarm circuit consists of music integrated circuit IC3, audio amplifier integrated circuit IC4, speaker BL and related peripheral components.