Variable input amplified speaker with improved power input section
US5164991A · kind A · utility
20Cited by
18References
7Claims
0Family size
Inventors
Key dates
| Filing date | Feb 13, 1990 |
| Grant date | Nov 17, 1992 |
| Priority date | — |
| Expiry date | Feb 13, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F1/56
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An amplified speaker has an amplifier section including an audio amplifier powered from a power input section and a variable audio input section for supplying an input audio signal via an audio transformer to the audio amplifier. The power input section includes a rectifier bridge and a capacitor filter circuit, so that power may be obtained from an inexpensive unregulated AC source rather than an expensive regulated DC power supply. The variable audio input section permits audio signals at various levels from 30 mVrms to 70.7 Vrms to be inputted.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.