| 摘要 |
PURPOSE:To prevent the participation of noises in data and to reduce the error, by switching from a high voltage to a low voltage in a buffer section for protecting data in correspondence to an index detect signal. CONSTITUTION:When a head load signal is generated, the front edge of the signal is detected by a front-edge detecting circuit 22 and a head load front-edge detecting signal is generated, and then, a multi-trigger signal is generated from an OR gate 23 and multi-output is obtained. Then, a high-level output is generated from the Q-output terminal of a multivibrator 24 and a low-level output is generated from the Q-output terminal of the multivibrator 24. When the low- level output is supplied to a D-type flip-flop 25, the flip-flop 25 is preset, the Q-output terminal of the flip-flop 25 becomes a high level, a transistor Q1 is turned on, and a voltage of about 12V is impressed upon a stepping motor 10. The output of the multivibrator 24 disappears. |
