Automatic Timing Controller Circuit Composed of 555

Published:2011/5/29 1:19:00 Author:Joyce | Keyword: Automatic, Timing Controller, 555 | From:SeekIC

As shown in the figure is the automatic timing controller circuit. This circuit constitutes of an electronic watch, detection circuit (C1, D1), amplifying circuit, monostable multiply delay circuits (555, BG3 W2, C6 and), and relay J etc. And the timing signal source is from the end part of the electronic watch segment C. When the end part P changes into R,the voltage of segment C will rise to 3V.And the signal will be detected D1、C1 and amplified by BG1 and BG2 before it is sent to feet ② of 555 to trigger the operation of 555 circuit. When the negative pulse of BG2 comes, the monostable multiply delay circuit would turn, then feet ③ would output high level, and the time of monostability will be 1.1Rw2C6β,βbeing the amplification factor of the current of BG3.



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