| 摘要 |
PURPOSE:To improve the recording characteristic by connecting a resistor between one end of the secondary winding of a high frequency transformer connected to an output terminal of an oscillator and a reference potential point, connecting a recording head to the other end, and connecting a power supply voltage control element between a voltage supply terminal of the oscillator and a power supply so as to simplify the process and to eliminate the need for the adjusting process. CONSTITUTION:A power voltage supply terminal of a bias oscillator 21 is connected to a power supply VCC via an emitter collector path of a power supply voltage control transistor(TR)Q, its output terminal is connected across the primary winding of the high frequency transformer 23, one end of the secondary winding of which is grounded via a resistor R and the other end of the secondary winding of which is connected to one end of a recording head 24. The other end of the recording head 24 is grounded via a capacitor C, connected to the output terminal of a recording amplifier 25, and connection is performed to the base of the TRQ so as to apply current feedback from a connecting point between the resistor R and one end of the secondary winding of the transformer 23 via a rectifier circuit 26 and an amplifier 27. |
