• on Test & Measurement
  • Published in issue 7/2008 on page 45
About the article

Discrete PWM Generator

PWM waveforms are commonly used to control the speed of DC motors. The mark/space ratio of the digital waveform can be defined either by using an adjustable analogue voltage level (in the case of a NE555 based PWM generator) or digitally using binary values. Digitally derived PWM waveforms are most often produced by the timer/counter modules in microcontrollers but if you do not want to include a microcontroller in your circuit it’s also quite simple to generate the signals using discrete logic components.
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