Not what you were asking for but maybe this will help.

There is an example circuit for driving 2.3 inch, 8 Volt, AND2307SLC
common-cathode displays in this data sheet.

http://pdfserv.maxim-ic.com/arpdf/MAX7219-MAX7221.pdf


Paul


> I have some 7 segment displays matrixes that need +8v to drive them. I
> can handle the low side drive from a pic (pretty simple!) but the high
> side is what has me puzzled. Can anyone shed some light on the best way
> to configure some transistors to drive them. My electronic skill ends
> shortly after the low side drive.
>
> I would rather it if the line has to be high to have the segments
> selected, as thats how the code I have written is working on a small
> display at the moment.

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