H03G3/22 - CPC Classification Index

ClassID:

220239 ⎘

H03G3/22 - CPC Classification

Classification description:

Gain control in amplifiers or frequency changers without distortion of the input signal; Automatic control in amplifiers having discharge tubes

Sub-classes:

Audio output circuit and audio device

Electronic circuit arrangement for receiving low frequency electro-magnetic waves with an adjustable attenuator element

Electronic circuit arrangement for receiving low frequency electromagnetic waves with an adjustable attenuator element

Amplifier bias control

MASTER VOLUME CONTROLLING DEVICE

System and method for enhancing audio output of a computing terminal