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Uses RCA CA3018 four-transistor array as current-mirror triad with low 4 mpedance buffered output, to serve as high-performance summing amplifier. Mea-sured harmonic distortion is less than 170 at voltage gains up to 50 and with output swing of 10V P-P. High output impedance of 51 kil-ohms can be buffered by Q2 connected as emitter-follower.-W.G.Jung. Monolithic-Triad Cument Summer, EDNIEEE Magazine, July 1,1971,p52.

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