15_min_DELAY

Published:2009/7/12 21:13:00 Author:May | From:SeekIC

When S1 is closed, C1 begins charging, After delay determined by setting of 10-megohm pot, UJT conducts and makes C1 discharge through 27-ohm resistor, triggering SCR C106 and energizing relay. 0pen S1 to reset circuit.-I, Math, Math's Notes, C0, April 1974, p 64-65 and 91-92.



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