RTL_TTL_PROBE

Published:2009/7/2 21:46:00 Author:May | From:SeekIC

Static LED indicates logic Ievel at probe tip. Dynamic LED indicates presence of high or 1 pulse at probe tip even though momentary, because circuit stretches pulse to about 50 μs for easy visibility. Pulse stretcher requires at least 100-ns 4-V pulse. 1N4001 diode protects against reversed power leads. Probe requires +5 V from circuit under test. LEDs and transistor are not criticaL-Circuits, 73 Magazine, April 1974, p 31.



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