MB6582: LEDs (all) flickering very slightly

[neilbaldwin]

The LEDs on my MB6582 flicker ever so slightly. Just enough to notice, not enough to be annoying. I'm using bright ones (white) and have installed headers so I can change the current limiting resistors so suit the brightness. I've used 10K ones which is just nice and at first I wondered if they were maybe too low so I swapped a couple for 3K which, while brighter, still exhibited the flicker.

 

In every other respect the machine operates normally.

 

Is it normal? If not, does anyone have any suggestions of where to start testing?

 

Thanks,

 

Neil

[Hawkeye]

Hi Neil,

 

as the LEDs are driven in a time-multiplexed manner, a bit of flicker is inherent - normally you shouldn´t be able to see it, but it can be easily filmed by cameras.

The flicker may be more prominent because of the used LED type (not technically proven, but as they are high brightness, maybe the light emission shuts down more quickly than with standard LEDs, when they are multiplexed...)

 

Many greets,

Peter

Edited September 9, 2013 by Hawkeye

[neilbaldwin]

That was my guess: 100+ LEDs and only 16 lines feeding them I suspected a multiplexing type of solution but didn't want to stick my neck out :)

 

Thanks Peter.