ECU7 EFI project plans
Orin Eman
orin at wolfenet.com
Wed May 5 18:55:26 GMT 1999
> You need a spray can of positive photoresist. Radio shack
> probably has it. You spray it on the clean board (two light coats).
Anyone seen it recently? The precoated boards are expensive.
though not so bad at:
http://www.web-tronics.com/webtronics/printed-circuit-board-supplies-positive-photo-resist-pre-sensitized-pcbs.html
> Cure it for 20 mins at about 140F (oven set as low as possible is
> good). Align your laser printed transparency on the board. Make
> sure the toner side is down or you loose the details. Sheet of
> picture frame glass over the top to press it down flat. Expose 4
> inches under a flourescent tube for 30-60mins per side. UV lights
Anyone tried a black light UV tube? I'd guess the exposure time
will be a few minutes only.
Orin.
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