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Strobing is usually a sign that the PWM frequency is way too low, or that they should have used a better cap to filter or smooth the output voltage -or, worse yet, that software PWM is failing due to variable response time in a system which does not employ proper multi-tasking. There should be no requirement for high speed changes in a simple brightness circuit, so smoothing would be desirable. Further, most micro controllers available today provide for one or more timer/counters capable of hardware PWM which is greatly preferred.
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