| 摘要 |
PURPOSE:To improve S/N in a signal from a magnetic head and output it. CONSTITUTION:A diode circuit 30 made of silicon joining type diode is provided between amplifier circuit 26 and a second amplifier circuit 27, and noise components incorporated in a signal are eliminated almost, and the amplification of the noise components remained from the elimination is suppressed. Further, the signal from the magnetic head is amplified so that an output level in a signal component becomes 1.0V or above in the first amplifier circuit 26. |
