STEPS_FOR_CURVE_TRACER

Published:2009/7/10 5:49:00 Author:May | From:SeekIC

Square waves with 1-V amplitude and 1/60-s period, 2 V at 1/30-s, and 4 V at 11-15 s are generated by μL914 MVBR and μL923 flip-flops U2-U4, for combining in simple ladder network to give staircase waveform. Flip-flops count down MVBR output. Complementary-amplifier stage Q10-Q11 drives phase splitter Q12. Output of phase splitter goes through S1 to appropriate current source, Q13-Q14 or Q15-Q16, for supplying base terminal of device under test (DUT). Use 2N3904 for Q10, Q12, Q15, and Q16. Use 2N3906 for Q11, Q13, and Q14,-R. P. Ulrich, A Semiconductor Curve Tracer for the Amateur, QST, Aug. 1971, p 24-28.



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