SIMPLE_CONTINUITY_TESTER_FOR_PCBs

Published:2009/7/6 3:49:00 Author:May | From:SeekIC

Circuit NotesThis tester is for tracing wiring on Printed Circuit Boards. Resistors below 50 ohms act as a short circuit; above 100 ohms as an open circuit. The circuit is a simple multivibrator switched on by transistor T3. The components in the base of T3 are D1, R1, R2, and the test resistance. With a 1.5 volt supply, there is insufftcient voltage to turn on a semiconductor connected to the test terminals.



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