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First, the delay trigger circuit : consists of BG4, BG5, BG6, from the power switch is turned on, according to a certain time interval to send a pulse to control other parts.
2. Monostable delay circuit: consists of BG2, BG3 and BG1. It receives the pulse signal from the trigger circuit, automatically turns it on and turns on the relay that controls the bell to make the bell work. After a certain delay time, it automatically closes. Bell Power Supply.
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