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Path: utzoo!mnetor!seismo!rochester!kodak!ornitz
From: ornitz@kodak.UUCP (barry ornitz)
Newsgroups: sci.electronics,rec.audio,rec.ham-radio
Subject: Re: PC board photo etching kits
Message-ID: <885@kodak.UUCP>
Date: Tue, 7-Jul-87 21:16:58 EDT
Article-I.D.: kodak.885
Posted: Tue Jul  7 21:16:58 1987
Date-Received: Sat, 11-Jul-87 01:45:31 EDT
References: <2392@uwmcsd1.UUCP>
Reply-To: ornitz@kodak.UUCP (barry ornitz)
Organization: Eastman Kodak Co, Rochester, NY
Lines: 55
Keywords: PC boards,GC electronics
Summary: Recommendation for an excellent book on the subject.
Xref: mnetor sci.electronics:909 rec.audio:2397 rec.ham-radio:1873

In article <2392@uwmcsd1.UUCP> neighbor@csd4.milw.wisc.edu.UUCP (Jeffrey Alan Ding) writes:
>
>Hello.  Does anybody out there etch PC boards?  I have a kit from
>GC electronics that uses chemicals to transfer a pattern onto the PC board.
>The artwork for the pattern is done on transparent plasic.  The artwork is
>placed onto a PC board which is photo sensitized and exposed to Ultra Violet
>light.  Then the PC board is developed and the pattern appears on the
>PC board.  This method is very useful if multiple PC boards are wanted having
>the same circuit design.
>
>I'm wondering if anybody out there has used this stuff.  I'm having a bit
>of trouble photo sensitizing my own PC boards.  I've tried the process
>with PRE-sensitized boards and it works great.  But the boards that I
>sensitize do not work at all.  If any of you have any experience doing
>this I would appreciate any info on how to make it work.  Oh one more thing,
>I'm using POSITIVE method.  There are both positive and negative methods.

Jeff, I sensitize my own boards most of the time with consistently good results
using Kodak KPR resist which unfortunately Kodak recently sold the rights to
another company.  Resist of this type has a definite shelf life and is quite
sensitive about how it is stored.  I have rarely had any luck using the spray-
on resists sold by GC, etc.  This products rarely sells quickly and is useless
if overheated in the can.  You might consider the Photo-Blue or Photo-Green
(tm ?) presensitized boards which develop in a non-solvent developer which is
much safer to use.  If you really want the high definition needed for complex
PC boards, you will probably have to go with the KPR type resists.

Now for a plug - especially since Kodak sold off their interests.

Buy the book, "Electronic Prototype Construction" by Stephen D. Kasten.  This
book is published by Howard W. Sams (ISBN 0-672-21895-X) and can be ordered
through most major electronic distributors.  The cost is about $18 and your
money will be very well spent.  Steve presents some of the most practical
information I have seen on the subject.  The book is well suited to beginners
as well as more experienced users.  The book is full of photographs and
illustrations and is a storehouse of useful tips.  Even if you value your time
at next to nothing, this book will save you money.  All hams and electronic
experimenters should have a copy.

If this sounds like a blatant ad, it is.  Steve is a coworker and close 
personal friend.  I feel as if I have created a monster because I was the one
to introduce Steve to hamfests as a source of electronic goodies and junque.
It seems that on every occasion, he is working on a new project with parts
he bought at a hamfest.  Buy his book - he needs the royalties to buy more parts
and supplies.  Seriously, his book is every bit as good as I said it was!
                                                Barry
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|  ___  ________  |
| |  / /        | |  Dr. Barry L. Ornitz   UUCP:...!rochester!kodak!ornitz
| | / /         | |  Eastman Kodak Company
| |< < K O D A K| |  Eastman Chemicals Division Research Laboratories
| | \ \         | |  P. O. Box 1972
| |__\ \________| |  Kingsport, TN  37662       615/229-4904
|                 |
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