Audio fidelity amplifier and preamplifier systems

Details Audio fidelity amplifier and preamplifier systems Audio fidelity amplifier and preamplifier systems

1975-12-31

1977-12-20

Olms, Douglas W.

179 1SW, H04R 312

Patent

active

040643646

ABSTRACT:
An audio fidelity system which may adopt the form of a preamplifier or a preamplifier-amplifier combination and which includes facilities for mixing any of a plurality of input sources. In addition, the system permits equalization of the frequencies in each of a plurality of audio fidelity channels in the provision of a separate potentiometers for each of the major frequency of each channel. The circuit is uniquely designed to eliminate hum which normally occurs in low-level switches by eliminating the feedback through the amplifier circuits.

REFERENCES:
patent: 2110358 (1938-03-01), Dreisbach
patent: 3541260 (1970-11-01), Jarvis
patent: 3878472 (1975-04-01), Osakabe
patent: 3914549 (1975-10-01), Bose
patent: 3921104 (1975-11-01), Gundry
patent: 3941931 (1976-03-01), Osakabe
Electronic Analog Computers by G. Korn, McGraw-Hill, 1956, pp. 12 & 13.

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