In this article, I will describe
how you can make a PWM DC speed controller. This is a pwm controller with 555. It can be used as a 12v motor speed controller.
Sometimes we need a 12v speed controller to control the speed of a DC motor for our project. It is a very simple PWM controller without a microcontroller.
The circuit is working with a very popular timer Ic555 & an N-type MOSFET Z44.
The MOSFET & IC both are easily available & low in price.
Application of PWM controller
It can control any DC motor under 12v dc 20-25 Watt maximum load.
It can be used for robotics projects, As a PWM dimmer, controlling dc fan speed, and controlling LED light brightness, as a PWM fan controller.
The maximum input voltage is 12V DC.
Working of the circuit
The ic 555 generates a frequency (PWM signal) . We can control its wavelength using the potentiometer.
The power MOSFET is used as a driver.
Project video tutorial
What is a PWM signal?
You need to make
- 20K potentiometer
- Perfboard
- LED
- Capacitor 470 mfd
- Ceramic capacitor 100K pf
- Resistor 1K – 2pcs & 56 Ohms
- Diode 1N4007 – 3pcs
- MOSFET – Z44
- Heat sink for MOSFET
- IC 555 & 8 pin ic base
- 2pin terminal block – 2pcs
Z44 Mosfet pinout
Circuit diagram
Download circuit diagram
Spacial connection diagram for beginner
You have to do this project on a perf board for testing, you can use a breadboard.