HIGH_ACCURACY_CURVE_TRACER

Published:2009/7/11 2:09:00 Author:May | From:SeekIC

Can be used with any calibrated CRO, formatching and testing transistors or diodes by comparing performance curves. All opamps are 709C. Triangle wave generated by IC1-IC2 is fed to Schmitt trigget Q1-Q2, which generates square wave having transitions at zero voltagecrossings of input triangle. Q3 clamps square wave to 6.3 V P-P. Flipflop Q4-Q5 generates same square wave but at half the frequency of triangle wave. Combining square waves gives three-step staircase voltage having steps precisely in phase with zero signal crossings of triangle wave. T1 is UTC A-20 audio transformer, and T2 is Stancor P-6411 I5-W 1:1 isolation transformer. Article covers construction, alignment, and use, and gives circuit of suitable regulated supply operating from ±110 and ±6.3 V available in AN/USM-140C military version of Hewlett-Packard 170 CRO.-A. J. Klappenberger, An Accurate Solid State Component Curve Tracer, CQ, July 1974, p 20-24 and 82.



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