TIMED_SAFETY_CIRCUIT

Published:2009/6/17 20:57:00 Author:May | From:SeekIC

When S1 is closed, pin 9 of U1 goes low, turning on Q1 for a preset period. If S2 is closed during this period, Q2 is turned on for a preset period. R11 and R13 set the two time periods.



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