Playback preamplifier for magnetic tape recordings

Details Playback preamplifier for magnetic tape recordings Playback preamplifier for magnetic tape recordings

1983-08-19

1985-06-18

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of the amplifier

G11B 502

Patent

active

045243964

ABSTRACT:
For every playback head (6) on the head wheel (1) a sector (5) of the head wheel disk carries a preamplifier consisting of two amplifier branches operating in phase opposition, each having an input transistor stage of the grounded emitter configuration and an output transistor stage of the grounded collector configuration (sometimes referred to as an emitter follower). Both stages have voltage negative feedback. The outputs of the amplifying branches are respectively connected to opposite ends of a rotary primary coil of a multiple transformer serving to couple the rotating preamplifier circuits to stationary outputs. Blocking capacitors prevent the flow of equalizing currents in the event of any deviations from electrical symmetry. The circuit is usable for playback of recordings in the form of digital signals picked up at a rate of 2 megabits per second.

REFERENCES:
patent: 3032719 (1962-05-01), Beck
patent: 3068327 (1962-12-01), Davidson
patent: 3465321 (1969-09-01), Reisfeld
patent: 4357637 (1982-11-01), Gilbert
patent: 4389683 (1983-06-01), LeLandais

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