Homebrew PCBs

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Philip Pemberton wrote:
> Hi guys,
>    My two Stouffer 21-step step gauges arrived the other day, and I'd like to 
> use them to figure out an exposure for a positive-acting precoated photoresist 
%<

Check <http://www.thinktink.com/stack/volumes/volvi/filmimag.htm> there
you have the explanation on using step gauge

 --
 Best regards,
 Zoran A. Scepanovic
 zastos@...
 +381 63 609-993
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