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Variably biased audio amplifier

阅读:874发布:2023-07-08

专利汇可以提供Variably biased audio amplifier专利检索,专利查询,专利分析的服务。并且There is disclosed an audio amplifying output circuit for a receiver which includes biasing means for operating the output transistor to a minimum operating current level. The circuit is DC coupled to the preceeding stage as for example, the IF detector stage, so as to receive the DC component of the detected carrier signal. The DC component of the detected carrier signal is applied directly to the base of the transistor to increase its collector current in accordance with the amplitude of the driving signal thereby preventing transistor cut-off when signals of higher levels are received thereby.,下面是Variably biased audio amplifier专利的具体信息内容。

1. A variably biased audio amplifier comprising: a. a transistor having a base, emitter, and collector with a collector-emitter circuit defining means for deriving an output signal from the amplifier; b. a detector circuit for receiving a carrier signal modulated by an audio signal and providing said audio signal and the DC component resulting from the detection of the carrier signal; c. a variable resistor directly connected to said detector circuit for receiving thereacross the audio signals and the DC component and having a variable arm; d. minimum biasing means connected to said variable resistor for establishing a minimum operating current level for said transistor; and e. said variable arm of said variable resistor being connected directly to the base of said transistor for applying the audio signal directly to the audio amplifier and for utilizing the DC component as a variable bias.
2. A variably biased audio amplifier as set forth in claim 1 wherein said minimum biasing means includes a diode.
3. A variably biased AC amplifier comprising: a. a transistor having a base, emitter, and collector with a collector-emitter circuit defining means for deriving an output signal from the amplifier; b. means for providing an AC signal and a DC component; c. a variable resistor directly connected to said signal providing means for receiving thereacross the AC signals and the DC component and having a variable arm; d. minimum biasing means connected to said variable resistor for establishing a minimum operating current level for said transistor; and e. said variable arm of said variable resistor being connected directly to the base of said transistor for applying the AC signal directly to the amplifier and for utilizing the DC component as a variable bias.
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