Current controlled emitter coupled multivibrator
US4083019A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 1, 1976 |
| Grant date | Apr 4, 1978 |
| Priority date | — |
| Expiry date | Dec 1, 1996 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/91
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A multivibrator circuit has a main constant current source through which the main portion of the current of the multivibrator circuit is supplied and a by-pass current source through which a portion of the current to be supplied to the main constant current source is supplied, whereby the duty cycle of the multivibrator circuit is controlled. When the by-pass current is changed, the frequency of the multivibrator circuit is changed. The frequency of the multivibrator, when used as the frequency-modulated oscillator in a video tape recorder, may thus be set regardless of the signal clipping level and signal clamping level in a video recording circuit of the video tape recorder.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.