The 555 timer IC is a handful of active components ... In this case, they’re being used to create a basic PWM motor controller. The trick is to set the 555 up in astable mode, and use diodes ...

“HW-687 is one easy module for adding speed regulation to your next DC motor-based project. It is a simple pulse-width–modulated speed controller providing ... are a multitude of PWM circuits that you ...

Described here is a simple, inexpensive and useful circuit for electronics hobbyists. The circuit is nothing but a PCB drill speed controller ... voltage drop and power loss Electrically a DC motor ...