Volume control circuit

Details Volume control circuit Volume control circuit

1981-06-19

1984-08-07

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330257, H03F 345, H03G 330

Patent

active

044646321

ABSTRACT:
A volume control circuit is provided which is not influenced by power supply fluctuations and which eliminates the audio signal component when the circuit is adjusted to minimum volume. An audio input signal is amplified by a differential amplifier and supplied to a substantially doubly balanced differential amplifier. Gain control of the audio signal is achieved by adjusting the bias voltage of the doubly balanced differential amplifier. The collector electrodes of two transistors used during minimum volume operation are connected directly to a power supply line. The controlled audio signal is supplied from the doubly balanced differential amplifier to a current mirror circuit which functions to cancel fluctuations in the power source. The connection of the collector electrodes of the two transistors in the doubly balanced differential amplifier to the power supply line functions to eliminate an audio component on the output when the volume control is set to minimum volume.

REFERENCES:
patent: 3684974 (1972-08-01), Solomon et al.
patent: 4065725 (1977-12-01), Lillis et al.
patent: 4219781 (1980-08-01), Naokawa
patent: 4331929 (1982-05-01), Yokoyama
Kubo, "Electrical Volume Control for Differential Amplifier", Denshi Tenbou, Nov. 1972, p. 74, Article No. 43.

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