ULTRA_PRECISE_LONG_TIME_DELAY_RELAY

Published:2009/6/25 21:12:00 Author:May | From:SeekIC

Circuit NotesPredictable time delays from as low as 0.3 milliseconds to over 3 minutes are obtainable without resorting to a large value electrolytic-type timing capacitor. Instead, a stable low leakage paper or mylar capacitor is used and the peak point urrent of the timing UJT (Q1) is effectively reduced, so that a large value emit-ter resistor (R1) may be substituted.



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