AUDIBLE_PROBE

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

Speeds troubleshooting by eliminating need to look at meter, and prevents possible damage to logic under test by minimizing possibility of shorts occurring if probe slips when looking at meter. Components used with A-8402 IC give 1-kHz output for 6-V input.Binary counter divides this signal to give output in low audio range and converts to square wave more suitable for driving loudspeaker. Probe can also serve as input for digital voltmeter.When probing TTL circuits, probe gives low frequency for 0 state, high frequency for 1, and middle frequency for open circuit. Output transistor type is not criticaL-G. E, Row, Audible Logic Probe Doubles as DVM Input Section, EDNMagazine, Oct. 20, 1977, p 82.



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