Electronic record/play switch with low noise low input impedance

Details Electronic record/play switch with low noise low input impedance Electronic record/play switch with low noise low input impedance

1998-06-08

2000-08-29

Kim, W. Chris

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of the amplifier

360 68, 360 62, G11B 502, G11B 1512

Patent

active

061117188

ABSTRACT:
The present application discloses an electronic switching device in combination with a low noise, low input impedance preamplifier circuit. The resulting electronic preamp assembly is specifically configured so that it can be directly interchanged with existing mechanical relay/preamplifier assemblies such as those presently in use in recorder/reproducer apparatus having dual function record/playback heads, without disturbing the associated operating parameters of the record or playback channels. The electronic preamp assembly includes a balun transformer and a solid state switch coupled from a record amplifier to the record/playback head via a rotary transformer to define the record channel. The playback channel includes a diode bridge switch and a preamp circuit also coupled to the rotary transformer and head. The playback channel is electrically isolated from the record channel, and vice versa, via the solid state switch and diode bridge switch in response to a select play/record mode signal applied thereto.

REFERENCES:
patent: 4203139 (1980-05-01), Horiuchi
patent: 5204790 (1993-04-01), Yang
patent: 5249087 (1993-09-01), Berkheimer
patent: 5852527 (1998-12-01), Fujii

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