| 摘要 |
PURPOSE:To enable a simple constitution to stop the operation of a writing method when a power voltage falls in level, by controlling a transistor via a Zener diode whose across voltage corresponds the fall of the power voltage. CONSTITUTION:Once power voltage +V1 falls, a voltage across Zener diode ZD2 corresponding to voltage +V1 also falls to cut off a current through transistor Q1, and transistor Q2 turns OFF. Therefore, a write output of JK type FF3 corresponding to write data is never applied to magnetic head 2 and regardless of the write enable state by buffer circuit 1, the simple constitution stops the writing operation while the power voltage is low, so that the breakdown of magnetic recording data due to the inflow of an error write current can be prevented. |
