How to Control Motor Speed Using PWM with NE555 Timer & Darlington Transistor in Proteus

Описание: This video demonstrates a motor speed control system using PWM (Pulse Width Modulation) with the NE555 timer IC and Darlington transistor (TIP142) in Proteus Software. The circuit allows smooth speed adjustment using a potentiometer.

Key Features:

NE555 in Astable Mode: Generates adjustable-frequency PWM signals.
Darlington Transistor (TIP142): Handles high-current motor loads.
Potentiometer Control: Adjusts duty cycle (0%–100%) to control motor speed.
Protection Diodes: Prevent voltage spikes and reverse current.

How It Works:

PWM Generation:
The 555 timer produces square waves whose duty cycle is set by RV1.
Higher duty cycle = higher motor speed.
Motor Drive:
The TIP142 amplifies the PWM signal to drive the motor.
D3 filters noise, and D1/D2 protect against back-EMF.

What you’ll learn:

How PWM controls motor speed.
Role of Darlington transistors in power applications.
Protection techniques for motor circuits.
Simulating real-world motor control in Proteus.

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