This article begins with a schematic of an inverter-based circuit that outputs a variable duty-cycle square wave.Īdditional schematics take that output wave and control a sample DC motor driver and an example 7-segment LED display. So, the electronic circuits in this article use only off-the-shelf, readily-available components such as logic chips, diodes, resistors, transistors, and capacitors. However, some people aren’t comfortable programming a microcontroller. To me, the simplest and most flexible PWM is generated by a microcontroller. Pulse-width modulation is a digital technique for varying the amount of power delivered to an electronic component.īy adjusting the amount of power delivered to a motor or LED, the speed or brightness (respectively) can be controlled. How to Make a PWM Circuit without a Microcontroller
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