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 Title: |
US4701957:
Dual mode music instrument preamplifier
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Smith, Randall C.; Petaluma, CA 94952
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| Assignee: |
None
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| Published / Filed: |
1987-10-20
/ 1986-11-26
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| Application Number: |
US1986000935270
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| IPC Code: |
Advanced:
G10H 1/16;
G10H 3/18;
H03F 1/32;
Core:
G10H 1/06;
G10H 3/00;
more...
IPC-7:
H03G 3/00;
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| U.S. Class: |
Current:
381/061;
084/728;
330/149;
984/329;
984/367;
Original:
381/061;
084/001.19;
330/149;
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| Field of Search: |
381/061,62,63,118,120
330/051,149
084/1.19,1.16
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| Priority Number: |
| 1986-11-26 |
US1986000935270 |
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| 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.
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| Attorney, Agent or Firm: |
Harrison, David B. ;
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| Primary / Asst. Examiners: |
Isen, Forester W.;
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| INPADOC Legal Status: |
None
Family Legal Status Report
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| Family: |
Show 2 known family members
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First Claim:
Show all 8 claims |
I claim:
1. A preamplifier circuit for enhancing sound generated by a musical instrument such as a guitar and which is converted into electrical signals comprising:
- an input for receiving said electrical signals,
- a passive high impedance input network connected to said input,
- first preamplifier means connected to said passive input network for non-distortion amplification of said electrical signals in a first mode of operation and capable of saturation distortion amplification of said electrical signals upon being overdriven in a second mode of operation,
- an output terminal connected to the output of the first preamplifier means and including an output attenuation network,
- commonly actuated switch means for switching between said first mode of operation and said second mode of operation,
- overdrive amplifier means connectable to bridge across said passive input network in response to said switch means for overdriving said first preamplifier thereby to cause saturation distortion amplification of said electrical signals, and
- shunt network means switchably connectable across said output terminal in response to said switch means thereby to equalize output amplitude of said preamplifier circuit between said first and said second modes of operation.
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| Background / Summary: |
Show background / summary
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| Drawing Descriptions: |
Show drawing descriptions
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| Description: |
Show description
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| Forward References: |
Show 21 U.S. patent(s) that reference this one
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