Clipping indicator circuit for transistor amplifier
US4090146A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 29, 1977 |
| Grant date | May 16, 1978 |
| Priority date | — |
| Expiry date | Jun 29, 1997 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F17/00
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A light-indicator circuit is disclosed which permits visual indication of clipping caused by the over-driving of a transistor amplifier. The circuit includes a light-emitting diode connected in parallel with the collector-emitter path of a switching transistor which is biased to conduct during low-signal-level operation of the amplifier. The switching transistor is caused to switch to its non-conducting state when the amplifier is overdriven, thereby activating the light-emitting diode. Means may be provided to delay switch-back once activation of the light-emitting diode has occurred. Means may be provided to inhibit activation of the circuit by over-driving signals of limited duration.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.