On Saturday, June 28, 2008 9:34 AM [GMT-3=3DCET],
Tom=E1s =D3 h=C9ilidhe  wrote:

> The largest display multiplexer I've ever done that actually looked good
> (i.e. it was nice and bright and had no observable flicker) had 16
> stages (i.e. 16 individual LED's).
>
> Have you any idea what the "maximum" amount of stages is? Would it be
> possible to make a multiplexer that has 42 stages? I'm using the
> PIC16F887 to orchestrate the display multiplexer. If I want to pull this
> off, should I definitely run the PIC at 20 MHz?

Look at the bottom of this page,
http://www.geocities.com/proyectosenpic/

I did it several years ago with a 16F872 at 20Mhz
There were 40 columns.
I do not recomend this circuit neither the method (column by column)
Raw by raw is better and you can reduce the frequency of the oscillator.

Dennis


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