| 摘要 |
PURPOSE:To obtain a stable low noise effect in a drive circuit for a motor to drive a stepping motor, etc. CONSTITUTION:In order to generate a trapezoidal wave pulse for driving a motor from a trapezoidal wave generator 11, an F/V converter 24 generates a comparison voltage responsive to a clock signal, compares it with threshold voltages, and varies a current for generating the pulse in response to a signal of a comparison result. The pulse is generated from the current and a phase- excited pulse to be sent from phase-excited pulse generating means 22 through a rotting direction switching circuit 23. |
