CPC Subgroup
H03F 3/21 with semiconductor devices only
Full Title
Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements > Power amplifiers, e.g. Class B amplifiers, Class C amplifiers (H03F3/26 - H03F3/30 take precedence) > with semiconductor devices only
3 direct subcodes
Child Classifications
Navigate with arrow keys, Enter to open
- H03F 3/213 in integrated circuits
- H03F 3/217 Class D power amplifiers; Switching amplifiers