Amplifier power supply controlled by audio signal

Details Amplifier power supply controlled by audio signal Amplifier power supply controlled by audio signal

1982-09-23

1984-06-05

Pitts, Harold I.

Electrical audio signal processing systems and devices

Voice controlled

381123, 381120, 381 86, 455343, H04B 300

Patent

active

044532644

ABSTRACT:
A power control circuit (22) for selectively supplying power from a constantly available power source (20) to an amplified speaker (12) by sensing the existence of an audio signal in a differential stage by determining the differential potential signal between leads (16, 18) to produce a ground reference signal which is amplified by a transistor (28) and thereafter rectified (52) to provide a direct current signal which operates a relay driver transistor (42) which, in turn, operates a relay switch (46) to supply power to the speaker amplifier (14). The discontinuance of power to the speaker amplifier is delayed for a period of time after the discontinuance of the audio signal to the differential stage (24) by placing a capacitor (58) between the rectifier and the relay driver transistor (42) to power the relay driver transistor for a period of time after the audio signal is no longer being provided.

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