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From: John Popelish
Organization: This space not available for advertising.
X-Mailer: Mozilla 4.7 [en] (Win98; U)
Subject: Re: Etching!
Date: Fri, 18 Oct 2002 13:51:10 GMT
NNTP-Posting-Date: Fri, 18 Oct 2002 09:51:10 EDT
"M=E4rt Pikkani" wrote:
> I don't know if this is rihgt newsgroup to get my answer but i will try=
> not, then could anyone recomend me a newsgroup from where i could get
> Here is what i did.
> I printed out my PCB on to a tranparency. Then used money detector as U=
> light an got tracks onto board. With NaOH (developer fluid) the tracks
> became clear and visible.
> Then used Fe3Cl to etch the Cu around the tracks.
> tracks are still with clear and visible but Problem is that Cu around t=
> tracks changes its color( like Pink) but doesn't leave the PCB clear.
> Meaning that all the plate is still covered with Cu but little Cu has l=
> the PCB. I could feel the edge of the track with my finger.
> What is my problem?
> is it money detector (UV ligth), which I don't believe.
> Do I do something wrong?
> Is it problem of etching bouder?
> M=E4rt Pikkani
Sounds like you did everything right, except wait long enough for the
ferric chloride to finish the job. Most people heat and agitate the
etchant but I prefer a different method for single sided boards. =
I put the etchant in a plate or saucer and fill it just far enough
that the board will sit on the surface copper side wetted in the
etchant while it rests o the plate at the 4 corners. Sometimes I have
to try quite a few bowels and saucers before I find one that fits the
board. I slide the board down from one edge, to let the air escape
from under it as the board wets. The etchant that is loaded with
copper is quite a bit more dense that fresh etchant, so it convects to
the bottom of the container, and fresh etchant rises to take its
place, with no agitation needed. With most kinds of board material
you can watch the traces form through the back of the board. For
opaque material, you can lift it and take a look every 5 minutes or
so. The whole process takes about 15 minutes at room temperature with
1 oz copper. With this method, so little etchant is used per board,
that it is pretty well exhausted and can be discarded after 1 use
(after precipitating it to harmlessness by dumping a load of baking
soda into it till it quits fizzing).
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