Solid state electrical musical instrument amplifier

Details Solid state electrical musical instrument amplifier Solid state electrical musical instrument amplifier

1984-05-07

1986-04-08

LaRoche, Eugene R.

Amplifiers

Signal feedback

Phase shift means in loop path

330 59, 330109, 330294, 330302, H03F 134, H03F 308

Patent

active

045815879

ABSTRACT:
A solid state electrical instrument amplifier includes an instrument signal input, a preamplifier, and circuitry in association with the preamplifier and preferably in a feedback loop of the preamplifier, for adjusting the frequency compensation of the preamplifier. The amplifier may also include distortion circuitry, again preferably located in a feedback loop of the preamplifier, which compresses the peaks of the input signal thereby giving a distorted output of the preamplifier which maintains the relative even and odd harmonic content of the input. The amplifier may also include a variable band reject filter operated by a sweep rate generator which varies the light output of a light emitting diode which in turn varies the resistance of photoresistors in the variable band reject filter. If signal delay circuitry is included to create a reverberation effect, the amplifier also includes a high pass filter in parallel with the delay circuitry to increase the high frequency content of the output signal. In addition, a modified power amplifier may be included with an integrated circuit operational amplifier input D.C. coupled to the rest of the circuit.

REFERENCES:
patent: 4107622 (1978-08-01), Toyomaki
patent: 4151477 (1979-04-01), Yokoyama
patent: 4179669 (1979-12-01), Dodson et al.

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