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From: Tom Woodrow
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.0.2) Gecko/20021120 Netscape/7.01
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Subject: Re: Making 2 Layer PCB's
NNTP-Posting-Date: Fri, 17 Jan 2003 06:19:17 GMT
Organization: AT&T Broadband
Date: Fri, 17 Jan 2003 06:19:17 GMT
Made em at home, made em at work. Used kepro pre-reststed copper clad
FR4 (double sided) laminate, a circuline forescent light for exposure,
and a ceramic bowl crock pot for etching.
Cleaned the resist off after etching with a freon degreaser. It worked
but it was an environmental nightmare.
Layout the board so that components can soldered on both sides of the
board whet a feedthru is necessary.
Use accessable feedthru pads where you can solder a jumper wire from one
side to the other (use this instead of a plated thru hole)
If you need the place a feedthru jumper under a component, solder the
feedthru jumper in BEFORE you install the component.
As for allignment top to bottom when etching, place unsed pads at
opposite corners (or on all four corners if you like) of your layout.
Drill these holes BFFORE you expose the double sided copper laminate.
Allign your film on one side then drill the corner holes, then expose
that side. To expose the second side allign your film on the backside
using the same corner holes. The smaller the holes, and the more
accurtely they they are centered in the pads on the file, the more
accurate the side to side allignment will be.
All the above is in the saaumption you are using photoresist board
material (kepro or such).
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