PULSE_WIDTH_MONITOR

Published:2009/7/15 5:45:00 Author:Jessie | From:SeekIC

Circuit turns on upper pilot lamp when pulse width is less than predetermined minimum value, because upper 7473 JK flip-flop is clocked when pulse falls to ground before 74121 mono recovers, triggering upper SCR on. Similarly, 8601 mono is set to coincide with specified maximum pulse width; if pulse falls to ground after this mono recovers, its JK flip-flop is clocked and lower (greater than) lamp is turned on. Fault indication is held until reset button is pushed.-J. Kish, Jr., Three ICs Monitor Pulse Width, EDN Magazine, March 20, 1973, p 86.



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