Patent classifications
H
ELECTRICITY
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H03
ELECTRONIC CIRCUITRY
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H03G
CONTROL OF AMPLIFICATION
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3/00
Gain control in amplifiers or frequency changers
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H03G3/30
in amplifiers having semiconductor devices
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H03G3/3005
in amplifiers suitable for low-frequencies, e.g. audio amplifiers
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H03G3/3026
the gain being discontinuously variable, e.g. controlled by switching
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H03G3/3031
using switched capacitors
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