Temperature insensitive DC voltage detection and protection circ

Details Temperature insensitive DC voltage detection and protection circ Temperature insensitive DC voltage detection and protection circ

1978-02-24

1979-04-17

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including protection means

307360, 330257, H03F 3183

Patent

active

041503392

ABSTRACT:
A circuit for detecting a DC signal in the output of an audio amplifier 1 and for uncoupling a speaker SP in response thereto comprises a low-pass filter 2 whose output is coupled to one input of differential amplifiers 5, 6 whose other inputs are unbalanced by respective positive and negative threshold biasing potentials E.sub.1, E.sub.2. The differential amplifiers are directly connected to respective current mirror circuits 7, 8, and their high impedance side collector outputs are applied to the inputs of an OR circuit whose output in turn controls the speaker uncoupling.

REFERENCES:
patent: 3987368 (1976-10-01), Ahmed
patent: 4030012 (1977-06-01), Buhler
patent: 4034268 (1977-07-01), Klauck

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