Archive of the former Yahoo!Groups mailing list: Homebrew PCBs

----- Original Message -----
From: "mumin55555" <MUMIN55555@...>
To: <Homebrew_PCBs@yahoogroups.com>
Sent: Tuesday, February 17, 2004 7:35 PM
Subject: [Homebrew_PCBs] its me from the etching tank question again!


> here in israel, thought we are a very advanced country- it is
> sometimes very hard or impossible to find equipment for certain
> things. so, i want to built the etching tank by myself. can someone
> please explain me exacly how this "spray etcher" works???


The etchant is pumped through 'spray bars', tubes with holes drilled in
them. For a small unit you might only need a couple of them. Some
experimentation will be needed to get the pressure and hole size correct.
Spray etching has the advantage of speed - Mega Electronics claims 90 s with
fresh ferric chloride for their spray etcher. It does cost 1600 GBP, though.

Leon
--
Leon Heller, G1HSM
Email: aqzf13@...
My low-cost Philips LPC210x ARM development system:
http://www.geocities.com/leon_heller/lpc2104.html