Circuit for providing a symmetric current to the head of a magne

Details Circuit for providing a symmetric current to the head of a magne Circuit for providing a symmetric current to the head of a magne

1986-11-07

1989-03-28

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Head amplifier circuit

360 68, G11B 509

Patent

active

048169323

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.

REFERENCES:
patent: 4521817 (1985-06-01), Sasamura et al.
patent: 4551772 (1985-11-01), Sliger
Marshall, S. E., "Disk File Write Current Generator", IBM TDB, vol. 23, No. 3, Aug. 1980.
Ainscow, F., "Write Current Stabiliser for Multielement Magnetic Head", IBM TDB, vol. 15, No. 8, Jan. 1973.
Chaloupka et al., "Magnetic Head Write Driver", IBM TDB, vol. 13, No. 8, Jan. 1971.
Walter G. Jung, "IC OP-AMP Cookbook", 1974, pp. 175-176, Archive Drawing No. 50218-001.

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