DC Motor Speed Controller Circuit Diagram using IC 555

Hey, in this article, we are going to build a very simple DC Motor Speed Controller using IC 555. This circuit contains few components so you can easily build this circuit at your home. You can control the speed of a 9V or 12V DC Motor very smoothly. A DC motor speed controller circuit using the IC 555 timer is a popular and simple circuit design. We know the 555 timer IC is commonly used in various timer, pulse generation, and oscillator applications. To create a DC motor speed controller using the 555 timer, we can design a Pulse Width Modulation (PWM) circuit. PWM is a technique used to control the average voltage supplied to the motor, thereby controlling its speed.

I always recommend you use PCB boards to build any electronic circuit or projects. PCBs provide a stable and reliable platform for mounting components. This can lead to improved circuit performance and reduced chances of loose connections or short circuits. A PCB board also allows you to design a more compact and organized circuit layout, which can be especially beneficial if you're aiming for a neat and space-efficient design. Using a printed circuit board (PCB) for your DC motor speed controller circuit can offer several advantages, but whether you should use a PCB depends on your specific requirements, skills, and resources.

Circuit Diagram

Let's see the circuit diagram of the DC Motor Speed Controller Circuit Using IC 555.

DC Motor Speed Controller Circuit using IC 555

List of Components Used

  • IC NE555 - 1 PCs
  • Transistor 2N2222 - 1 PCs
  • Transistor 2N3055 - 1 PCs
  • 100K Potentiometer - 1 PCs
  • 1N914 Diode - 2 PCs
  • 1N4007 Diode - 1 PCs
  • 2.2 Kilo-ohm, 1/4 watt resistor - 2 PCs
  • 1 Kilo-ohm, 1/4 watt resistor - 1 PCs
  • 1.5 Kilo-ohm, 1/4 watt resistor - 1 PCs
  • 1 uF Ceramic Capacitor - 1 PCs
  • 0.1 uF Ceramic Capacitor - 2 PCs
  • 9V-12V DC Motor - 1 PCs
  • 9V-12V DC Power Supply

IC NE555: Here, the NE555 timer IC is the heart of this circuit. It's used in an astable mode to generate a PWM signal, which controls the speed of the DC motor by varying the duty cycle of the signal.

Transistor 2N2222: This transistor acts as a buffer to isolate the control voltage from the NE555 timer's output. It helps in amplifying the PWM signal and driving the more powerful transistor (2N3055) for controlling the motor.

Transistor 2N3055: This is a power transistor that's used as a switching element to control the motor's voltage. It handles the current and voltage required by the motor.

100K Potentiometer: The potentiometer is used to adjust the control voltage, which in turn adjusts the duty cycle of the PWM signal generated by the NE555 timer. This control voltage determines the motor's speed.

1N914 and 1N4007 Diodes: These diodes are used for protection purposes. Diodes can be used to protect against back EMF (electromotive force) generated by the motor when it's turned off, which can cause voltage spikes that might damage components.

2.2 Kilo-ohm, 1/4 watt resistor: These resistors are used for biasing and voltage division for the IC 555 input circuit.

1 Kilo-ohm and 1.5 kilo-ohm Resistor: These resistors are used for voltage division and current limitation purposes at the IC 555 output circuit.

Ceramic Capacitors: The 1uF ceramic capacitor is used to build the RC network to determine the frequency of the IC 555 timer. And the 0.1uF capacitors are used for noise removal purposes.

9V-12V DC Motor: This is the motor you're controlling. The speed of the motor is regulated by adjusting the PWM signal generated by the circuit.

9V-12V DC Power Supply: This power supply provides the necessary voltage for the entire circuit and the motor.

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DC Motor Speed Controller Circuit Diagram using IC 555 DC Motor Speed Controller Circuit Diagram using IC 555 Reviewed by Author on August 24, 2023 Rating: 5
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