±7_VDC_OFFSET

Published:2009/7/10 21:58:00 Author:May | From:SeekIC

High-impedance current source Q4 provides desired level shiftfor AC signals in video circuit whose DC level controls intensity of CRT. Input and offset signals are fed to base of Q3 which drives complementary-symmetry emitter-follower Q1-Q2. For values shown, level can be shifted about ±7 VOC.-P.B. Uhlenhopp, Variable DC Offset Using a Current Source, EDN|EEE Magazine, Aug. 15, 1971, p46.



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