TRANSISTOR_CURVE_TRACER

Published:2009/7/11 2:31:00 Author:May | From:SeekIC

When fed with staircase waveform of base-culrent generator, circuit generates series of current-voltage (I-V) curves as function of base current, for transistors and other three-terminal semiconductor devices. Cathodefollower U5 and inverting controlled-gain amplifier U6 can be eliminated if correct sense of current indication is not essential. S11 switches multiplier R9 in and out; R9 is 18 megohms (about 9 times input resistance of CRO). C1 is 7-13 pF mica trimmer. Diodes are 1N4822. U5 and U6 are Fairchild 741. T2 is Knight 54A3800 or equivalent variable autotransformer rated 1 A. T3 is Knight 54A141O or equivalent power transformer with 125-V 15-mA and 6.3-V 0.6-A secondaries.-R. P. Ulrich, A Semiconductor Curve Tracer for the Amateur, QST, Aug. 1971, p 24-28.



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