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Old 01-18-2022, 06:38 PM   #25
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Join Date: Sep 2016
City & State: Victorville, CA
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Default Re: LED Array Schematic Check?

Originally Posted by sam_sam_sam View Post
but when I look at the volt meter with out the capacitor on the output you could see the voltage fluctuation with your eyes but after putting the capacitor on the output it smooth out the voltage fluctuation and was less notable
Which reminds me ... I need to look at the output of this PWM dimmer with the cap on it with the scope ... curious to see what it looks like.

Here are some screenshots of the scope when I had the PWM dimmer connected to 19 volts then the output was connected directly to the scope (not under load at all).

If I'm not mistaken, the phantom traces in that third image, which are clearly distinguishable from the real signal ... is a result of the scope being unable to lock onto the signal thoroughly because the signal is so crappy in the first place.
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