ECU7 EFI project plans

[xxalexx at ix.netcom.com]

I just threw out by MG etch tank, heater and bubbler.
The FeCl is nasty, not something to keep in house.
The landlord freaked when she saw that red carpet.
After 2 years and alot of cleaning it  stills has a red tint,
still have some red splash marks on walls and red pants.
I got some flex boards, that you just run thru a laser printer
and etch, but have not tried.  Article is in Nov. 97 of
Electronics Now.  
I have heard of exposing in sun.
According to Jan Axelson book.
300 watt quartz halogen headlight
275 watt sun lamp
15 watt black light
any light source 350-425 nanometers
There is alot of info on web, check newsgroup FAQ's
Circuit Design in Central Point OR. made the lowest
cost single sided boards I could find and all they need is
a sketch  Only problem is they take several months and
there web site seems to be gone.
I am going to try pcbmilling.com
had problems with pcbexpress.com software but they
have plated thru holes.
alex
> > 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.
> 
>