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On Mon, May 26, 2008 at 02:10:16PM +1200, Apptech wrote:
> > Looks OK to me (P channel fets excepted).
> 
> Looks OK.
> Feels like you should be able to reduce the FETs to row / 
> column but my brain refuses to reveal how.

I know 'eh? I've been thinking about this one for months myself. I did
find some rather broken commercial flip-dot modules, which had two
dioded per element, but the actual driver circuitry was missing. One
module I found had no diodes at all, but I suspect that it must have
used some magnetic hysterius tricks, like how core memory works, and
besides was constructed entirely from bundles of magnet wire woven
through the ferrite elements, very different than the sub-modules I
actually bought.

Using a duel-rail power supply might help, but I'd rather avoid that
complications really anyway.

- -- 
http://petertodd.org 'peter'[:-1]@petertodd.org 
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