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On Wed, Jun 20, 2007 at 05:51:23PM -0400, Timothy J. Weber wrote:
> Peter Todd wrote:
> > "Print out a 1:1 copy of your gerbers and see if the mounting holes on
> > your board are in the same galaxy as the ones on your associated LCD
> > screen... idiot."
> 
> Yes, I've made that rule for myself.  Several times.  Still don't follow 
> it...
> 
> > Nice... I caught myself happily laying out traces to an IC recently on a
> > complex double sided board, LED digits on one side, smd parts on the
> > other. Unfortunately said IC and the digits were on the same side...
> > stupid xpcb and it's lack of keepouts...
> 
> Scotty said we canna change the laws o' physics, but some days I'd 
> settle for a slight change in the laws of geometry.

Oddly enough on that same I ended up kinda changing the laws of
geometry, or at least layout.

See, these are rather large, current sucking, 2.5" high 7 segment leds.
In my usual fashion I figured I'd put one 1.5A 7808 regulator per led to
drive the common anodes.

But it's such a crowded board, oh where oh well will I put all those
regulators?

Fortunately the LEDs actually have two parallelogram shaped pockets on
the backside in the middle of upper and lower boxes formed by the digit
segments...

- -- 
http://petertodd.org
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