Quote:
Originally Posted by dave cox
My analysis is the OC outputs (9,6,8,5) are either :-
(1) delivering too much current, pulling the voltage low. Controlled by R1320 & R1323 (681), R1339 & R1338 (36)
(2) their load is too high a resistance, R1347 (280R), R1343 & R1341 (56), R1403 & R1401 (60R4)
Gilbert cell 155-0078-00
dc
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It should really be named a Jones Cell, Jones invented it in the early 1960's and did not patent his work. The Nagra tape recorder company also used the 4 quadrant multiplier as a phase detector in their machines to crystal lock the tape speed, prior to the Gilbert patent too. It makes for a great scope input amplifier as a monolithic IC (temp drifts cancel) and it is extremely easy to invert a channel by altering a reference voltage on one of its ports.