Homebrew PCBs

=========ORIGINAL MESSAGE:

Date: Thu, 03 Feb 2005 02:19:23 -0000
   From: "dgrant_79" <david.grant@...>
Subject: Re: Home PCB kit


--- In Homebrew_PCBs@yahoogroups.com, "Stefan Trethan" 
> > 
> > The soldering is the limit, not the board, usually.
> > If you want to use toner transfer instead of the more complicated  
> > photoprocess you might be limited to 8mil tracks or so.
> > 

> Well, 8mil sounds like plenty! Plenty as in, very small.

Hmmm...  Well...  OK.   But I routinely use 6.67/1000ths-inch (2/300ths-inch) tracks and spacing, with toner transfer, with very close to a 100% success rate. I have also routinely used 6.67/1000ths-inch tracks (2/300ths-inch) with 3.33/1000ths-inch (1/300th-inch) spacing, with no problems (with an HP LJ 4 @ 600DPI, in both cases).

And, in very-limited tests, I have even had almost 100% success with 1.67/1000ths-inch tracks (i.e. 1 dot wide printed with an HP LaserJet 4 at 600 dots per inch (i.e. 1/600th-inch wide, on screen), with HP toner on Staples' "Picture Paper", as before) (but unfortunately didn't test the same size-range for the spacing limit).

Tom Gootee

http://www.fullnet.com/u/tomg/gooteepc.htm

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