How to Control Dimness/Speed of 12v Components on 24v 3D Printers Using PWM

Good 3D printers mostly come with 24 volt power supplies these days. This is a problem when you want to run common 12 volt components such as fans and LEDs and control the speed/dimness using Pulse Width Modulation (PWM). Using a Step Down Voltage Regulator and an N-Channel Mosfet this is a fairly easy task to accomplish, but first we need to learn about pull-down and pull-up resistors.

NOTE: The schematic shown at 8:40 has a mistake in it. The resistor must connect to the gate of the mosfet marked "G". It should not connect to the grounded source pin of the mosfet. Thanks to Tomasz Biskup for catching that mistake. Read his top pinned comments for more information.

Ebay Buck Converter with Built in Mosfet: https://www.ebay.com/itm/DC-5v-24v-to-1-8v-3-3v-12v-2A-Adjustable-Buck-Step-down-Voltage-Regulator-Module/322365006847?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649

If that link is broken just do an ebay search for "DC 5v~24v to 1.8v 3.3v 12v 2A Adjustable Buck Step down Voltage Regulator Module" ... https://www.youtube.com/watch?v=5zN2mR_N7j0