TRANSISTOR_DIODE_TESTER

Published:2009/7/10 23:49:00 Author:May | From:SeekIC

Checks for polarity, shorts, and opens in one measurement, using six LEDs as indicators. Circuit derives three-phasewaveform from 2-kHz ring-of-three oscillator for application to device under test through LEDs. Oscillator waveform serves to make each pair of device terminals forward, reverse, and unbiased in turn for one-third of a cycle. Current flowing into device turns on red LED, and current flowing out turns on green LED, to indicate polarity and position of base lead.-N. E. Thomas, Semiconductor Tester, Wireless World, March 1977, p 43.



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