Low voltage, constant current magnetic transducer drive system f

Details Low voltage, constant current magnetic transducer drive system f Low voltage, constant current magnetic transducer drive system f

1992-12-17

1994-07-19

Hajec, Donald

Dynamic magnetic information storage or retrieval

General recording or reproducing

Thermomagnetic recording or transducers

360 46, 360 66, G11B 500, G11B 509, G11B 503

Patent

active

053314778

ABSTRACT:
A magnetic transducer has its opposite coil extremities connected to a direct current power supply via a pair of inductance elements, respectively. The transducer coil is excited not only from the power supply but from the inductance elements as a write control circuit applies a binary write control signal, representative of digital information to be recorded, to a pair of semiconductor switches thereby causing the same to be alternately turned on and off. Being typically in the form of metal oxide semiconductor field effect transistors, the semiconductor switches permit the flow therethrough of a current of varying magnitudes when open. A pair of reverse blocking diodes are therefore connected in series with the respective semiconductor switches in order to make constant the current flowing through the transducer.

REFERENCES:
patent: 3618119 (1971-11-01), Rodriquez
patent: 3763383 (1973-10-01), Johnson
patent: 4466027 (1984-08-01), Howell et al.
patent: 5216553 (1993-06-01), Nakamura

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