Miniature guitar amplifier

Details Miniature guitar amplifier Miniature guitar amplifier

1978-06-28

1980-03-18

Mullins, James B.

Compositions

Liquid crystal compositions

84 116, 179 1F, 179 1VL, 330265, 330282, H03F 3183

Patent

active

041941659

ABSTRACT:
A miniature guitar amplifier, having at least one very small (13/4 inch) speaker driven by complementary transistors connected in an emitter-follower push-pull arrangement, is made to sound very much like a large guitar amplifier having one or more large (12 inch) speakers by providing negative feedback to an operational amplifier that drives the power transistors. The operational amplifier has a differential input stage to provide a noninverting input terminal for the signal from a guitar pickup and an inverting input terminal for the feedback signal.

REFERENCES:
patent: 3478158 (1969-11-01), Trainor
patent: 3578913 (1971-05-01), Ufkes
patent: 3866063 (1975-02-01), Long
patent: 3898576 (1975-08-01), Fukaya

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