Homebrew PCBs

> Robin Whittle wrote:
>
> From the thread: "Kepro bench top spray etcher":
> 
> An eBay search for:
> 
>   magnetic pump
> 
> produces hundreds of results, some of them for
> small pumps costing less than $100.  Sorting
> by "price with shipping" groups similar products
> together.
>
> <SNIP - all th details on pumps and prices>

Quite coincidental timing here really.

I have just a few weeks ago finished the rotary
spray etcher I started in 2006 and am almost done
with my photo laser plotter started at the same
time. (I'm getting better only 5 years behind
schedule)

I am about to publish the details of both.  So
you might want to hold of spending $100s on pumps
for a few weeks.

The whole spray etcher can be built sub $30 if
you have a table saw ($40-$50 ish without)

It has a couple of sneaky tricks to sort out the
uniformity/banding issues Stefan Trethan had
when trying to build his (ref 1).

I built mine to accommodate 75x150mm boards.  It
could scale up a bit.  But if you where planing
doing big boards, I would opt for following
Adam Seychells design (ref 2).

BTW, does anyone have an archive of Adams work
aside from the CuCl bit?


1.
http://tech.groups.yahoo.com/group/Homebrew_PCBs/message/8579

2.
http://web.archive.org/web/20090103105924/http://members.optusnet.com.au/~eseychell/PCB/SprayEtcher/index.html