TRANSISTOR_PIN_FINDER

Published:2009/7/11 2:29:00 Author:May | From:SeekIC

Simple audio oscillator is assembled as shown and values of R1 and C1 adiusted for desired tone. General-purpose transistor to be tested is then substituted in circuit (NPN for Q1 or PNP for Q2) and rotated in socket until oscillator works again; pins then correspond to those of the good transistor. If oscillator will not work in any of three possible positions, transistor under test is bad.-Circuits, 73 Magazine, July 1977, p 34.



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