prototyping methods

[Bob Zimmer]

At 03:11 AM 9/22/97 -0500, you wrote:
>I use  the GC Electronics single sided pre-sensitized boards. Use a layout
>program that lets you make "donut" pads with a 0.010 inside diameter. Laser
>print a positive and get a positive "stat" copy made onto clear acetate
>(around $8 - 12 US). I expose the board with a photoflood and develop it
>with the GC developer. Etchant is available a Radio Shack. The local
>surplus store sells #65 carbide drill bits for $0.50. Drill the holes with
>a mototool (the donut pads will self center). Then I tin plate them (also
>GC). A 4"x6" board costs about $5 and takes four hours or so start to
>finish. Chemicals are somewhat expensive, $5 for enough developer to do 10
>4 x 6 boards. The nice thing is, you can't tell the difference from a
>commercial single sided board and you can turn a prototype in two days.
>
>Just my $0.02

Grant,

I'm curious about your tin plate process.  I tried a board awhile back and
got nothing worthwhile.  Would you mind elaborating?



  >=== Bob Zimmer -- Phila, PA     bzimmer at voicenet.com ===<
  >===         http://www.voicenet.com/~bzimmer/        ===<
  >=== "Oat-bran noise is more likely to be an issue in ===<
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  >===         Analog Dialogue - Analog Devices         ===<