Circuit for providing a symmetric current to the head of a magnetic recording device
US4816932A · kind A · utility
6Cited by
2References
28Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 7, 1986 |
| Grant date | Mar 28, 1989 |
| Priority date | — |
| Expiry date | Nov 7, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/02
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A write circuit for a streaming cartridge tape drive provides a substantially constant and symmetric write current to the magnetic write heads in the drive. The write current is provided by a pair of transistors coupled to the write head and the magnitude of the write current is maintained substantially constant by an operational amplifier coupled to the two write current transistors which regulates the voltage at the emitters of the two write current transistors.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.