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555 Timer PWM - Adjusting Duty Cycle without Changing Frequency

ahchah08

Jun 18, 2013
2
Joined
Jun 18, 2013
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I am wondering how to do this. I've been researching tons of articles and different circuits for the past few days, but none of them have done what I want.

A lot of the circuits I looked at would only allow minimum duty cycle changes without affecting the frequency. The closest thing I could find is here : http://www.learnabout-electronics.org/Oscillators/osc44.php

I am trying to ultimately achieve a circuit that would change duty cycle from 1% to 99% while keeping the frequency at 200Hz. I would keep it in a box and control using a pot or rotary switch.
 
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