LOGIC_PROBE

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

Provides almost as much information, when working with TTL or DTL digital circuits, as costly CRO or logic analyzer. Can be built into length of plastic tubing, with probe tip projecting at one end and two supply leads coming from other end.One LED flashes for high to low transition, and other for low to high transition. Flash is visible even with very narrow pulses, because probe circuit stretches pulse width. With S1 open (memory mode), pulse LED at right stays on until reset by operator, for capturing any stray pulse. If probe tip is held on open circuit or on chain of floating inputs, no LED will light.-C. W. Andreasen, Superprobe, 73 Magazine, Holiday issue 1976, p 92-93.



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