20_Hz_TO_200_kHz

Published:2009/7/5 23:27:00 Author:May | From:SeekIC

Variable-frequency RC-tuned oscillator uses FETs with Wien-bridge frequency-determining network, Identical resistors accurateto at Ieast 1% are switched in pairs to change range. Dual 365-pF variable capacitor C2 is used for tuning in each range. Can be calibrated against standard audio frequency with CRO set up for Lissajous figures, or calibrated with high-precision AF meter connected to AF output terminals.-R. P. Turner, FET Circuits, Howard W. Sams, Indianapolis, IN, 1977, 2nd Ed., p 132-134.



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