Tone control circuitry

Details Tone control circuitry Tone control circuitry

1979-08-16

1981-04-14

Mullins, James B.

Amplifiers

Signal feedback

Frequency responsive feedback means

179 1D, 330294, 330304, 333 28T, H03F 134, H03G 508

Patent

active

042622603

ABSTRACT:
A tone control circuit including an operational amplifier having (a) an input circuit or output circuit and (b) a feedback circuit where circuits (a) and (b) are symmetrically disposed with respect to a reference potential such as ground. Circuitry is also provided to compensate for load and/or feedback impedances. Further, circuitry is provided to reduce the number of switches and capacitors needed to vary the high and low cut-off frequencies of the tone control circuit.

REFERENCES:
patent: 3059190 (1962-10-01), Hafler

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