[sdiy] 7-seg LED driving frequency

[ChristianH]

On Tue, 25 Oct 2005 15:36:57 +0100 Seb Francis <seb at burnit.co.uk> wrote:

> Thanks Ken & Simon for your answers.
> 
> Going by my experience of 'comfortable' CRT monitor refresh rates I 
> would say that I should run it at 100Hz+ to get rid of any perception of 
> flicker.
> 
> But I was wondering whether I should try and run it above audio 
> frequency to try and avoid audible noise coupling into the power 
> supply?  Maybe I am worrying too much about nothing :)

I think that would be overkill. And the fact that you won't hear any
coupled noise doesn't mean it's not there - in the end it may be just
harder to find out why some amp stage or comparator is acting strange,
because it's being shaken by some 50 kHz.

Christian