Audio amplifier on-off control circuit
US5363062A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 21, 1993 |
| Grant date | Nov 8, 1994 |
| Priority date | — |
| Expiry date | May 21, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F1/305
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A circuit for controlling on-off switching of an audio amplifier in such a manner as to prevent sharp uncontrolled variations of the output during switching from resulting in undesired noise (popping) on the loudspeakers. For so doing, the circuit provides for generating a controlled positive potential at the negative input in relation to the positive input of the amplifier when this is switched on or off. More specifically, when switching on, the potential difference is maintained pending switching of all the sources on the amplifier, after which, it is gradually eliminated for enabling the output to reach the steady-state value slowly and in controlled manner; whereas, when switching off, the potential difference is generated gradually for enabling the output of the amplifier to be grounded slowly prior to turning off the amplifier itself.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.