En route to getting the off-the-peg DC-51 motor speed controller to ... referenced to 240Vdc for the control circuit. The current limit circuit (see diagram) compares this voltage to an adjustable ...

With the help of this DC drill speed ... of the drill. Using a power supply adaptor with a speed regulator like the one featured here can certainly improve the performance of the drill. Schematic of ...

This 8051 microcontroller-based control circuit adjusts the speed of a small permanent-magnet dc motor via photosensors ... was converted into a hex machine-code file using the ASEM-51 assembler ...