Patent ID: 6111718
Filing Date: 2000-08-29
Classification: G11B

Abstract:
An electronic preamplifier assembly for switching a record/playback head between record and playback channels so that a high voltage RF record signal is supplied to the head or a playback signal is retrieved by the head, comprising:means for providing select record and select playback mode signals;electronic switch means for supplying the high voltage RF record signal to the record/playback head while the playback channel is electronically isolated in response to the select record mode signal;said electronic switch means including transformer means for supplying an unbalanced high voltage RF record signal, and a pair of low voltage FETs having respective terminals and configured in parallel to receive the unbalanced high voltage RF record signal;wherein the terminals of the pair of low voltage FETs float in common in response to the select record mode signal and are equally driven by the unbalanced high voltage RF record signal, thereby allowing the low voltage FETs to handle the high voltage RF signal without breaking down; andpreamplifier circuit means for receiving the playback signal from the record/playback heads while electronically isolating the record channel in response to the select playback mode signal.