SUM_AND_DIFFERENCE

Published:2009/7/10 6:11:00 Author:May | From:SeekIC

Simple circuit using two BC109 or equivalent transistors is effective for summing and differencing two signals, as required in stereo and quadraphonic sound applications. For resistor values shown, upper output is -1/2(A + B) and lower output is -1/2(A - B). Will handle input signals up to 1.4 V. Bottom of 68K resistor should go to ground.-B. J. Shelley, Active Sum and Difference Circuit, Wireless World, July 1974, p 239.



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