.~ Variable impedance in feedback path varied by separate control path
DEFINITION
Classification: 330/86
(under subclass 75) Subject matter wherein the "signal feedback circuit means" has a variable impedance therein, which is varied by means of a control which may be a variable control voltage or a motor control means, the control to vary the variable impedance being derived, developed and applied by a path separate from that involving the variable impedance and the immediately associated signal transmission path.
(1) Note. This subclass excludes "nonlinear" or other impedances in the signal feedback path which vary merely by the signal feedback current flow therethrough and which are not provided with a "separate" means to control the variable impedance. Such subject matter is classified in subclasses 95 and 110 of this class.
SEE OR SEARCH THIS CLASS, SUBCLASS:
143, for amplifiers having a thermally responsive impedance which may be separately controlled.
144+, for amplifiers having a variable impedance for the signal channel varied by a separate control path. See the search notes thereunder.
