.~ With control of input electrode or gain control electrode bias {13}
141
.~.~ Time constant circuit in bias control circuit
DEFINITION
Classification: 330/141
(under subclass 129) Subject matter wherein "the bias voltage control means" includes a circuit of resistive and reactive elements, usually of resistive and capacitive elements, which serves to filter or "smooth out" the D.C.. bias voltage applied for control purposes to the amplifier device and wherein specific details or distinctive characteristics of such circuit are claimed.
(1) Note. Excluded from this subclass are the resistive capacitive networks for self-biasing a vacuum tube amplifying device.
SEE OR SEARCH THIS CLASS, SUBCLASS:
142, for resistive capacitive networks for self-biasing a vacuum tube amplifying device
143, for amplifiers having a thermally responsive impedance element including those with separate control thereof.
144+, for variable impedance for signal channel controlled by separate control path. 199+, for amplifiers and their power or bias voltage supply.
254, and 278+, for semiconductor amplifiers having signal amplitude (volume level) control.
290, for semiconductor amplifiers having D.C.. feedback for bias control.
296, and 297, for semiconductor device bias or power supply circuitry.
SEE OR SEARCH CLASS
320, Electricity: Battery or Capacitor Charging or Discharging,
166+, for charging or discharging a capacitor, per se.
333, Wave Transmission Lines and Networks,
138+, for passive time delay networks, subclasses 181+, for smoothing type passive filter networks.
363, Electric Power Conversion Systems,
44+, for conversion systems including D.C. smoothing filter networks.
455, Telecommunications, 234.1+, for automatic volume control in radio receivers; and subclass 343 for particular power or bias supply for radio receivers.
