TTL_PROBE

Published:2009/7/2 22:46:00 Author:May | From:SeekIC

LED comes on, and stays on until circuit is reset, if input probe receives low-level (negative-going) pulse when polarity switch is set as shown. For other position of switch, LED comes on for high-level or＋5 V pulse,－R .BShreve,Troubleshooting Logic Circuits,HamRadio.Feb 1977,p 56－59,



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