CIRCUIT_TRACER

Published:2009/7/20 20:45:00 Author:Jessie | From:SeekIC

Continuity tester delivers continuous audio tone when its test terminals are connected by resistance less than about 1 ohm. Circuit under test does not receive more than 3 V or 300 mA, depending on resistance between terminals. Tester ticks softly when switched on but is open-circuited, as reminder that battery drain is then about 0.8 mA. Tester uses sections of Motorola low-power MC3302P quad comparator as measurement comparator, 600-Hz tone oscillator, AF amplifier, and ticker. Pins 3 and 12 of IC are used in power supply.-R. C. Marshall, Continuity Bleeper for Circuit Tracing, Ham Radio, July 1977, p 67-69.



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