IPC Subgroup
H03G 9/3 all amplifying stages having semiconductor devices
Introduced: September 1968
Last revised: January 2006
Full Title
Combinations of two or more types of control, e.g. gain control and tone control > in untuned amplifying stages as well as in frequency-selective amplifying stages > all amplifying stages having semiconductor devices
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRONIC CIRCUITRY
- Subclass:
- CONTROL OF AMPLIFICATION