SIGN_CHANGER

Published:2009/7/6 6:46:00 Author:May | From:SeekIC

When switch S1 grounds pin 3 of opamp, circuit becomes inverter providing 180° phase shift. When S1 is at position A, input voltage acts on both inputs of A1 and no current flows through R1 and R2; output voltage is then equal to input voltage. Switch permits remote programming of phase reversal. For higher input impedance, 1556 opamp can be used.-W. G. Jung, IC Op-Amp Cookbook, Howard W. Sams, Indianapolis, IN, 1974, p 208-209.



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