TRANSISTOR_TESTER_WITH_SPEAKER

Published:2009/7/22 22:53:00 Author:Jessie | From:SeekIC

Blocking-oscillator test circuit provides tone from speaker only when transistor is good (not open, shorted, or leaky). Runaway transistors con be detected by providing npn-pnp switch and reversing it to stop oscillation for a few seconds, then restoring correct position. If transistor then oscillates al different frequency or will not resume oscillation, it is a runaway.-L. G. Sands, Dynamic Testers For Transistors, Electronics, 33:8, p 66-67.



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