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Flickering on PCA9685 PWM controller with 3W RGB LED

 
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PostPosted: Fri Jan 13, 2017 10:07 am    Post subject: Flickering on PCA9685 PWM controller with 3W RGB LED Reply with quote

Chuoi,
I do know too much about electronics, but a good friend of mine is an electrical engineer. I asked him if he had any ideas to help you. Here's what he said:

Tell him.
The way this works is to get the LED to "dim" your turning it on for 50 % of the time. Real dim= the LED is on for 25% of the time. What I think is happening is the 200 hz is too low for the DIM mode without flicker. Try 1000 hz. Using a cap on the LED side is a bad idea but it might help (prob not) on the 12V side. Also get a VHF handheld and scan the comm band for noise when you are running this. It is possible for these PWM switches to put out a lot of noise if not properly designed. You don't want to be dimming the lights to find out you got no comm receiver anymore!
Mike Dwyer







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