PULSE_FREQUENCY_DETECTOR

Published:2009/7/2 23:20:00 Author:May | From:SeekIC

Can be usedas digital-logic probe or as frequency detectorfor test equipment，Requires only two ICs,SN7406 hex inverter and SN5400 quad NAND gate. Will respond to square-wave pulses with 50% duty cycles up to 3 MHz. When pulse appears at input, points A and B deteet logic high level and make point E go high so latch sets and tums on LED. Without an inputfrequency, A and B will be complementary and E、will go low,resetting latch and turning off LED.-V, Rende,Digital Frequency Detector Uses Only Two IC's,EON Magazine， April 20,1976,p114.



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