Amplifier with alternate output level
US6724897B1 · kind B1 · utility
Inventor
Key dates
| Filing date | Aug 2, 2000 |
| Grant date | Apr 20, 2004 |
| Priority date | — |
| Expiry date | Aug 13, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F3/183
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A guitar amplifier having an input terminal, an audio output and an audio level controller connected between the input terminal and the audio output. The audio level controller includes a first attenuation path, a second attenuation path having a fixed attenuation and a switch connecting only one of the first or second attenuation paths between the input and the audio output. The switch is preferably controlled remote from the amplifier and preferably by a foot-controlled switch. The first attenuation path is preferably variable. The audio level controller can include a first variable resistor coupled to the input terminal and having a wiper coupled to the audio output, the first variable resistor being coupled to a source of reference voltage through a second resistor to form the first attenuation path, the switch being coupled between the junction of the first and second resistors and the source of reference voltage to provide the second attenuation path. Alternatively, the audio level controller can include a first variable resistor coupled between the input terminal and a source of reference voltage and having a wiper coupled to a first terminal of the switch, a second resistor…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.