Pwm Dc Motor Speed Controller Using 555 Timer

A simple dc motor controller circuit using ne555 is shown here.

Pwm dc motor speed controller using 555 timer. Good thing about 555 timer is that it can be powered with a voltage from 4 5v up to 16v. I used 12v high torque dc motor which i powered using there 3 7v li ion batteries connected in series which give around 12v. Building projects using small permanent magnet dc motor for cars robots quads requires a speed controllers to make them work flawlessly. A pretty cool circuit that allows you to control the speed of a dc motor of considerable size.

So now using the potentiometer we are able to control the speed of the dc motor or the pwm signal produces by the 555 timer ic. In order to buy all those speed controllers for a high price this tutorial will. In this part i will talk. Here we are going to see how to control the speed of the small dc motor using 555 timer.

For those who are not aware pwm or pulse width modulation is a modulation technique in where the width of the output pulse varies with with respect to time. Basic pwm motor speed control using 555 timer ics. Many dc motor speed control circuits have been published here but this is the first one using ne555 timer ic. 555 timer integrated circuit is only used is a stable condition.

By using this circuit we can operate direct current motor by using 555 timer ic integrated circuit. On this condition with few adjustment in circuit we can used the pulse width modulator. If you have a motor that requires 12v to turn on but the rpm at 12v is too high for your application pwm will allow you to drop the speed of the motor as if it was seeing 3v for instance. Motor speed rpm is directly proportional to the supplied voltage.

This circuit uses similar pwm technique to control motor speed and uses ic 555 to generate pwm signals. In addition to controlling the motors speed its direction of rotation can be also changed using this circuit. This is the first part of supposed to be a two part instructable about speed control of a dc motor using 555 timer ics meant to cater those who are still starting to make electronics a hobby and beginners like me in a way.