Popless amplifier

Details Popless amplifier Popless amplifier

1996-06-26

1998-08-18

Mullins, James B.

Amplifiers

Combined with automatic amplifier disabling switch means

330149, 381 94, 381120, H03G 334

Patent

active

057963037

ABSTRACT:
An audio amplifier that does not exhibit a "pop" during a change-of-state such as being turned on. The popless amplifier includes an operational amplifier to power a speaker, a circuit to prevent the application of an output voltage from the operational amplifier to the speaker for a selectable period of time and a circuit to charge the output of the operational amplifier to a selectable mid-rail voltage during the time a voltage from the operational amplifier is prevented from reaching the speaker.

REFERENCES:
patent: 4315221 (1982-02-01), Numata et al.
patent: 4366442 (1982-12-01), Yamata
patent: 5420535 (1995-05-01), Nebuloni et al.

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