SWITCHING_OPAMP

Published:2009/7/14 0:53:00 Author:May | From:SeekIC

Circuit provides change-over function when only single pair of contacts is available. With switch open, input A goes to output. With switch closed, input B goes to out-put and signal of input A is inverted by opamp so as to cancel direct signal A. Gain is unity for both output signals. Switch can be replaced by FET as in lower diagram; here, capacitor pre vents FET from cutting off during positive half-cycle above about 100 Hz. In multichangeover applications, opamp could be section of programmable opamp.-M. J. Sells, Electronic Changeover Switching, Wireless World, Dec.1974, p 503.



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