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This article describes how a simple circuit can be designed to control the intensity of a string of LEDs. The circuit is based on a common 555 timer IC that employs pulse width modulation (PWM) technique to control the voltage. The 555 IC is driven in an astable mode. The same circuit can be used to control the speed of a DC motor as well.
The most important component in this project is the 555 timer IC along with the MOSFET that works as a switch. The circuit works like a power electronics buck converter, which can be used to step down the DC voltage.
Components required for the project are listed in the table below.
| Bill Of Material | |
| • 555 Timer IC • IRFZ44N • 1k Resistor • 200-ohm Resistor | • 100nF Capacitor • 1nF Capacitor • 3×IN4001 Diode • 100k Potentiometer |
This project will be published in a few weeks. If you want to access it now, refer to Electronics For You’s July 2022 Issue–print or ezine edition.
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