COUNT_DOWN_TIMER

Published:2009/6/18 3:41:00 Author:May | From:SeekIC

With switch S1 in the off position, as shown, battery voltage is applied across timing-capacitor C1, which stays chargedwhile the rest of the circuitryhas no power supplied to it. Transistor Q1, and thus transistors Q2 through Q4, are kept in an off condition as long as C1 has a sufficient charge.



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