DC Motor Speed Controller - PWM Adjustable 0-20KHz Switch Drive Module, DC 5V...

EPLZON DC Motor Speed Controller - PWM Adjustable 0-20KHz Switch Drive Module...

Mosfet Switch Drive Module Dc 5v-36v 15a(max 30a) 400w Fet Trigger Switch Drivin

MOSFET Switch Drive Module DC 5V-36V 15A(Max 30A) 400W FET Trigger Switch...

Mini PWM DC Motor Speed Controller, DC 3V 6V2V 24V 35V 5A Speed Control 1

PWM speed control module for model trains 0-12v WITH Reversing Switch Attached.

DC Motor Speed Controller - PWM Adjustable 0-20KHz Switch Drive Module, DC 5V...

PWM Model Railway Speed Control Module. Cheap.