The speed tester circuit for testing transistor quality

Published:2012/12/3 20:33:00 Author:Ecco | Keyword: speed tester, testing , transistor quality | From:SeekIC

(1) The inserted NPN transistor is intact. IC's pin 3 is high, pin 4 is low, then the tested tube gets conduction, red light-emitting diode LED1 is light; when IC's pin 3 is low, pin 4 is high, then the tube is cut-off, LED1 and LED2 do not shine, the general view is twinkling light from LED1.



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