A Easy 555 PWM Circuit with Motor Instance

On this tutorial, you’ll discover ways to construct a 555 PWM Circuit. The 555 timer is likely one of the hottest built-in circuits for hobbyists. And one of many cool options is its potential to provide a PWM sign.

The circuit is pretty simple to make, and it may possibly management a fantastic number of issues, together with motor velocity and LED brightness.

555 PWM Circuit Diagram

Notice: For VCC, you need to use something from 5V to round 15V. What to decide on will rely totally on the dimensions of the motor you’re utilizing. Whether it is small, you may management every thing with 5V.

Elements Wanted

  • 555 Timer IC
  • IRLIZ44N MOSFET (or every other n-type MOSFET with an acceptable gate threshold)
  • 10 kΩ Potentiometer
  • 1 kΩ Resistor
  • 5 kΩ Resistor
  • 1 nF Ceramic Capacitor
  • 100 nF Ceramic Capacitor
  • 1N4001 Diode
  • Any DC motor

How the PWM 555 Circuit Works

The PWM 555 Circuit is called an improved 555 oscillator. It’s because it makes use of a few additional elements to enhance the output sign that the most typical astable multivibrator circuit would give. It makes use of R1 and C2 to regulate the frequency of the sign. And you’ll modify the responsibility cycle with RV1.

With the responsibility cycle, you may management the common voltage within the output of the 555, which makes it a really practical analog controller in your initiatives. For instance to regulate the velocity of a motor or dim an LED.

Within the instance beneath, we’ll join a motor.

Methods to Construct the PWM 555 Circuit

Right here you may see the circuit already constructed:

Here’s a nearer look, pay attention to the position of R1 and one of many diodes, that are positioned in a technique to not take an excessive amount of area:

The Outcome

On this video it is possible for you to to see the output of the PWM 555 Circuit, and the way the responsibility cycle adjustments whereas altering the worth of the potentiometer. It’s also seen that the change in velocity of the motor depends upon the responsibility cycle.


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