15_Hz_TO_40_kHz_IN_FOUR_RANGES

Published:2009/7/21 1:59:00 Author:Jessie | From:SeekIC

Tunable wide-range Wien-bridge audio oscillator is switched to cover 15-200 Hz, 150-2000 Hz, 1.5-20 kHz, and 3-40 kHz. U1 is high-input-impedance opamp in bridge circuit using thermistor as nonlinear feedback element. C1 is adjustable in series branch of bridge to compensate for capacitance (about 10pF) of ungrounded common terminal of dual tuning capacitor. Use ±15V dual regulated supply.-H. Olson, Integrated-Circuit Audio Oscillator, Ham Radio, Feb. 1973, p 50-54.



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