Recording/reproducing circuit for disk apparatus.

摘要

A recording/reproducing circuit for disk apparatus having a switching device (10) mounted between differential signal lines in the front stage of an automatic gain control amplifier (4). This switching device is controlled to be turned on/off by a write/read changing signal, so that the DC potential difference of differential outputs of an initial amplifier during the write time is removed, with generation of the transient state when the write mode is switched to the read mode being restricted. <IMAGE>