555 Ways To Speed Control A DC Motor. 20 Comments . by: Lewin Day. June 12, 2018. Title: Copy. Short Link: Copy. The 555 timer IC is a handful of active components all baked into one beautifully ...

The circuit in the figure provides three levels of speed control for a dc motor, using a PC’s parallel port (LPT1). A C++ program performs the control functions by allowing the signals from the ...