The practical door control burglarproof alarm circuit

Published:2011/7/4 21:58:00 Author:Borg | Keyword: door control, burglarproof alarm | From:SeekIC

The principle circuit of the device is shown in the figure, which consists of the trigger device, single steady time delay circuit, alarm sound generator, audio power supply circuit, light control circuit, preset lock circuit and power supply circuit, etc. When the room door is shut, the permanent ZT and normally closed reed switch are close to each other, the magnet power of ZT leads to the separation of the 2 contacting chip in AG, so the 6-pin of IC1A is in a high LEV, IC1A is reset, the 5-pin of the output terminal is in a low LEV, the dual-way SCR is blocked without trigger current.



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