Adjust the Duty Cycle of the 555 Timer without Changing the Frequency

This tutorial explains how to control the duty cycle of the 555 timer’s output. Not only does this design control the duty cycle but the frequency remains relatively stable during the adjustment. This is helpful for a number of applications such as working with pulse width modulation.

Schematic:

555 Duty Cycle Schematic

Formulas in the Video:

555 Duty Cycle Formulas



2 thoughts on “Adjust the Duty Cycle of the 555 Timer without Changing the Frequency”

  • Hi Jason,
    I found this very useful. Not just the schematic, but a good explanation about how it functions. And thanks for posting the jpeg images. It’s lots easier to grab these, rather than get a screen-grab from the video. I’ve learned a lot from your tutorials. Hope you continue.

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