Relay circuit with delay pull-in and delay release

Published:2011/4/19 6:19:00 Author:Nicole | Keyword: relay, delay pull-in, delay release | From:SeekIC

The circuit adopts single transistor circuit can achieve independent adjust delay pull-in and delay turn-off time, the circuit consists of a relay A with auxiliary contact a. After pressing switch S, capacitance C charges firstly, using potentiometer R2 can adjust pull-in time. After relay pull-in, auxiliary contact a connects resistance R5 and potentiometer R3 to transistor base, after switch S off, the ralay release time is determined by R3.



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