Audio signal amplifier circuit and a portable audio equipment using the same
US5787182A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 7, 1996 |
| Grant date | Jul 28, 1998 |
| Priority date | — |
| Expiry date | Aug 7, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F3/187
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The present invention resides in an audio amplifier circuit which includes an output terminal of an IC connected to a power amplifier circuit, a resistor having one end connected to a negative feedback input of the power amplifier circuit and the other end connected to a certain terminal other than the output terminal of the IC, a first capacitor connected between the output terminal and a loud speaker and a second capacitor connected between a wiring connecting the output terminal to the loud speaker and the certain terminal. A reduction of low frequency gain determined by a time constant of the first capacitor and an impedance of the loud speaker is corrected by an increase of of low frequency amplification gain determined by a time constant of the second capacitor and the resistor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.