Changeover circuit in tape recorder
AssigneeSony Corporation
InventorsKazuyuki Suda, Kazuo Murayama
Life of this patent
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Abstract
A changeover circuit in a tape recorder includes a recording and reproducing integrated circuit (IC) having a signal terminal and a bias terminal and arranged such that a DC potential at the signal terminal is set equal to that at the bias terminal, a changeover transistor whose collector and emitter are connected between a signal line connected to the signal terminal and the bias terminal, a controller for controlling the changeover transistor by supplying an output therefrom through a resistor to a base of the changeover transistor, and a bypass circuit connected between the bias terminal and a ground. The bypass state of the bypass circuit is controlled based on a control voltage from the controller.
Claims5
Apparatus for recording/reproducing a tape, comprising:
- a recording/reproducing head;
- a recording/reproducing circuit for connection to one side of the recording/reproducing head and having a voltage generating circuit for generating a reproducing bias voltage;
- a mode switching circuit for switching between a recording mode and a reproducing mode in response to a mode control voltage applied thereto;
- signal pass switching means connected to the other side of the recording/reproducing head for controllably connecting the reproducing bias voltage from the voltage generating circuit with the other side of the recording/reproducing head in the reproducing mode in accordance with the mode control voltage from the mode switching circuit and wherein an AC bias recording circuit is also connected to the other side of the recording/reproducing head;
- and
- bypass means activated by the mode control voltage and connected to a junction of the signal pass switching means and the voltage generating means to avoid supplying surplus current through the signal pass switching means to the voltage generating circuit in the reproducing mode.
Dependencies are inferred from the claim text.