Stereophonic system having power amplifiers and speakers in a br

Details Stereophonic system having power amplifiers and speakers in a br Stereophonic system having power amplifiers and speakers in a br

1978-06-05

1980-01-29

Olms, Douglas W.

179 1VE, H04R 504

Patent

active

041862732

ABSTRACT:
Left and right stereo power amplifiers receive power from the 12-volt D.C. automobile supply bypassed by a single capacitor for both amplifiers and energize left and right loudspeakers in series with the junction of the series-connected speakers coupled to ground through a capacitor that allows the left and right speakers to be independently driven by the left and right power amplifiers, respectively, by spectral components above the crossover frequency determined by the speaker impedance and the capacitor impedance. Each power amplifier is driven by an equalizing circuit including a photocell illuminated by an LED that is driven by a feedback signal from the power amplifier.

REFERENCES:
patent: 3394227 (1968-07-01), Hopengarten et al.
patent: 3435144 (1969-03-01), Csicsatka
patent: 3944941 (1976-03-01), Tsuda

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