Comprehensive protector belt circuit composed of 555

Published:2011/8/22 22:09:00 Author:Rebekka | Keyword: Comprehensive protector belt, 555 | From:SeekIC

Start upcircuit is composed of the start button QA, IC1 (555), IC2 (555), J1 and so on. When you press the QA, the +12 V voltage output by the buck rectifier circuit will be added to IC1, IC2, then relay J1 will be pulled. It also starts the bell ring. When it adds a +12 V voltage, the IC1 is set aspin potential of pin ② is low (the voltage on C1can not mutate), and C1 charges for R1, when the C1 charges to make IC1 ⑥ potential higher than 2 feet / 3VDD, IC1 will be reset.



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