Double-watch timer circuit (2)

Published:2011/5/17 20:35:00 Author:TaoXi | Keyword: Double-watch, timer circuit | From:SeekIC

AC220V is reduced by the transformer B and is full-wave rectified by the diode D1 and D2, then is filtered by the capacitance C, so we get the 14V DC voltage, this voltage can be added to the both ends of the SCR1, when the watch A outputs a timing alarm clock pulse (open), SCR1 is conducted, relay J1 gets the electricity and it's contact-point J1 closes, timing socket has the electricity to output, meanwhile J1-1's contact-point closes to make the preparation for SCR2 conduction, when the time is up,watch B outputs a timing alarm clock pulse (close), SCR2 is conducted, it's contact-point J2 cuts off, SCR1 cuts off too, also it's contact-points J1 and J1-1. Timing socket has no electricity to output. J2 recovers the closing state.



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