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RGB LED Driver Design

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ogden:

--- Quote from: amaschas on May 17, 2020, 10:59:27 pm ---I think I have stayed below my camera's flash sync speed for most of my test with early versions of the light, though that's mostly because it's not bright enough to shoot at faster speeds. I thought that the issue with flash sync was that above a certain speed the period of time the flash is on would not align with the period of time that the entire shutter is open. I didn't realize it was an issue with a light that's constantly on for the entire exposure.

--- End quote ---
Good idea to stay well below flash sync max speed because DSLR shutter physics is not that straightforward. It does not open in an instant. Shutted of 5D Mark II at 1/200 sec is wide open for much less that 1/200 sec time. YT video here. I did not care to investigate but it seems like it is < 1/400 sec or so. The rest of the time one of the courtains is moving over sensor, thus creating "banding" if your light source flickers. This is why I would try to make variable current control so LEDs do not flicker.

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