Dual mode music instrument preamplifier

Details Dual mode music instrument preamplifier Dual mode music instrument preamplifier

1986-11-26

1987-10-20

Isen, Forester W.

Electrical audio signal processing systems and devices

Sound effects

84 119, 330149, H03G 300

Patent

active

047019573

ABSTRACT:
A preamplifier circuit for enhancing sound generated by a musical instrument such as a guitar and which is converted into electrical signals includes an input, a passive high impedance input network connected to the input, a first preamplifier connected to the passive input network for non-distortion amplification of the electrical signals in a first mode of operation and for saturation distortion amplification of said electrical signals in a second mode of operation. A switch circuit enables switching between the first and second modes of operation. An overdrive amplifier bridges across the passive input network in response to the switch circuit for overdriving the first preamplifier thereby to cause saturation distortion amplification of the electrical signals. A shunt network may be switched across the output terminal to equalize output amplitude of the preamplifier circuit between the first and second modes of operation.

REFERENCES:
patent: 3493669 (1970-02-01), Elbrecht et al.
patent: 3663735 (1972-05-01), Evans
patent: 4180707 (1979-12-01), Moog
patent: 4211893 (1980-07-01), Smith
patent: 4286492 (1981-09-01), Claret
patent: 4446440 (1984-05-01), Bell
patent: 4480520 (1984-11-01), Gold
patent: 4495640 (1985-01-01), Frey
patent: 4593251 (1986-06-01), Smith
patent: 4644289 (1987-02-01), Kennedy et al.

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