Amplifying and equalizing

Details Amplifying and equalizing Amplifying and equalizing

1978-06-05

1979-12-18

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including gain control means

330 59, 330 86, H03G 528

Patent

active

041796691

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: 3441866 (1969-04-01), Barber et al.
patent: 3497621 (1970-02-01), Erath
patent: 3764745 (1973-10-01), Bottcher et al.
patent: 3911776 (1975-10-01), Beigel
patent: 4066976 (1978-01-01), Dickopp et al.
Koeblitz, "Photocell in Feedback Circuit Regulates Output," Electronic Design, Jun. 21, 1963, pp. 76, 77.

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