12V NE555 PWM Controller Under $3

While making my mini table saw I bought a 12 V motor speed controller module from eBay. Fair enough, I thought … that was an easier and straight forward solution. But then I decided to make my own.

I did some hunting around on the interweb and found a pretty good starting point in Circuits Today, but then, I needed to make some modification and tweaking of the circuit. I wanted to add in a toggle switch, a DC power socket and a 2 pin screw terminal into the design to make it easier to make and use.

There were some other minor alterations that I made to the design as I went, for convenience and to meet my specific needs.

12V NE555 PWM Controller Under $3

I also want to point out that this circuit is not simply a motor speed controller, but a PWM controller. On the one hand, that means that it can do a lot more than just vary the speed of a DC motor. This circuit will output a 12 volt current with a varying duty cycle. It can be used as 12 V DC:

  • Motor Speed Controller;
  • LED Dimmer;
  • Heat controller for a Polystyrene Hot Wire cutter;
  • voltage controller for an electrolytic etcher; and
  • etc.

The applications for this circuit are limited only by its 12 V DC nature. How you apply that is up to your imagination and experimentation. For instance, I’m thinking of using this circuit to make a vibrating platform for agitating my PCB production acid bath …

Parts you will need

All parts were purchased from eBay.

  • 1 x 0.01 uF ceramic capacitor
  • 1 x 0.1 uF ceramic capacitor
  • 2 x 1N4001 rectifier diodes
  • 1 x 1N4004 rectifier diodes
  • 1 x IRF530 100 V 14 A TO-200AB MOSFET
  • 1 x TO-220 heat sink
  • 1 x 2 pin screw terminal

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