CPC Subgroup
H03F 3/343 with semiconductor devices only
Full Title
Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements > DC amplifiers in which all stages are DC-coupled (H03F3/45 takes precedence) > with semiconductor devices only
3 direct subcodes
Child Classifications
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- H03F 3/345 with field-effect devices (H03F3/347 takes precedence)
- H03F 3/347 in integrated circuits