Motor Speed Controller using 555 Timer

A simple DC motor speed controller built using the classic 555 Timer IC.

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🔧 The Circuit

Here’s the soldered circuit I made on a veroboard:

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🖥️ PCB Design

Later, I designed a PCB using EasyEDA Pro.
Here’s the 3D view of the PCB:

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▶️ Demo Video

Watch the project in action on my YouTube channel:
👉 YouTube Demo

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⚡ How It Works

The circuit works using PWM (Pulse Width Modulation) generated by the 555 Timer IC in astable mode.

• The duty cycle of the PWM is adjusted with a potentiometer.
• This changes the average voltage applied to the DC motor.
• A MOSFET is used as a switch for efficient motor control.

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🛠️ Parts List

• 10nF Ceramic Capacitor
• 0.1µF Ceramic Capacitor
• 1N4148B Diode
• 1N4001 Diode
• LM555CN Integrated Circuit
• IRFZ44NPBF MOSFET
• 1kΩ Resistor
• 100kΩ Potentiometer

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✨ A classic example of how a small IC like the 555 Timer can be used to control motor speed.