| 摘要 |
PURPOSE:To constitute the titled device so that a head output is inputted to a reproducing amplifier through a pre-amplifier at the time of reproduction, and a head and a recording amplifier are connected at the time of recording, by providing a switching circuit with a diode, on the pre-amplifier, and thereafter, inserting it into the pre-stage of the reproducing amplifier. CONSTITUTION:A pre-amplifier 6 is connected through an input part 12 of an IC 9, and a diode 8, and a head 4 is connected to the input part of the IC 9 through a diode 7. In case a center tap of the head is held by a voltage of V1, the diode 7 becomes a conducting state by outputting from a recording amplifier 5 by a voltage V2 of V1>V2, at the time of recording, and recording can be executed. On the other hand, by applying a bias of a voltage V3 of V2>V3 to an output terminal of the pre-amplifier 6, the diode 8 does not conduct, and the pre-amplifier 6 is detached from the recording amplifier 3. Also, at the time of reproduction, when a bias voltage V4 of an input terminal of a reproducing amplifier is set to V3>V4, the diode 8 conducts, and a reproducing signal is inputted to the reproducing amplifier through the pre-amplifier. |
