Practical double-watch timing circuit (4)

Published:2011/5/17 22:03:00 Author:TaoXi | Keyword: Practical, double-watch, timing circuit | From:SeekIC

Related components PDF download: 9014 The circuit principle is as shown. After the process of buck, rectifier, filtering, this circuit supplies the working power supply to the control circuit. The bi-stable circuit is composed of the BG1 and BG2 and other external components, they work in the switching state. The control switch is composed of the BG3 and the relay to control the output of the AC 220V voltage. Both of the digital watches have the functions of point timekeeping and music button, they connect to the control circuit by using their two voice signal output line. Electronic watch 2 responsible for open, when it outputs the music electrical signal, the circuit cuts off BG2 by C6 and D7, at this time BG1 conducts to maintain this state.



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