Audio frequency transistor amplifier

Details Audio frequency transistor amplifier Audio frequency transistor amplifier

1976-04-20

1977-08-02

Mullins, James B.

Amplifiers

Modulator-demodulator-type amplifier

330 22, 330149, H03F 318, H03F 3183

Patent

active

040399648

ABSTRACT:
In an audio frequency transistor amplifier comprising an output amplifier circuit having a pair of complementary transistors, and a bias circuit having a resistor and a diode or diodes for biasing the pair of complementary transistors, the bias circuit generates harmonics of an audio signal to be amplified and reproduced due to nonlinear property of diode, thereby to cause a decrease in the articulation and resolution of a reproduced sound. This invention resides in coupling in parallel, in order to eliminate or reduce the harmonic noises generated by the bias circuit, at least one nonpolarized capacitor to the bias circuit. In addition to the nonpolarized capacitor, an electrolytic capacitor or polarized capacitor may be coupled in parallel to the bias circuit.

REFERENCES:
patent: 3721914 (1973-03-01), Nakamura

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