Patent
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.
Olms Douglas W.
Schaap Robert J.
Sultan Products, Incorporated
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