The circuit is a PCB drill speed controller, which can be used to control the speed of any 12VDC small pcb drilling units. Inexpensive and useful circuit for electronics hobbyists.

It’s a motor and an electronic speed controller all in one. This project is a continuation of [Carl]’s PCB motor project, which started with him routing coils for a brushless motor as traces ...

Updated again: IR-compensated motor speed controller With time on my hands, I decided to try a technique that I noticed first in a L200 voltage regulator data sheet.

A brushless motor requires a motor controller, and for most of us, this means cheap Electronic Speed Controllers (ESC) from a warehouse in China. [Ben] had a better idea: build his own ESC.

En route to getting the off-the-peg DC-51 motor speed controller to better suit my small milling machine, I had a go at working out what the circuit is.