10_min_DELAY

Published:2009/7/12 20:52:00 Author:May | From:SeekIC

MPF103 JFET makes charging current of C1 constant regardless of degree of charge, to give longer charging time and longer timedelay. After delay determined by setting of 10-megohm pot, UJT conducts and discharges Q, through 27-ohm resistor, triggering SCR and energizing relay. Open S1 to reset circuit.-I. Math, Math's Notes, CQ, April 1974, p 64-65 and 91-92.



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