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<DIV dir=ltr align=left><SPAN class=906402503-04032016><FONT color=#0000ff
size=2 face=Arial>Don't use ferric chloride. Use a combination of
hydrochloric (or muriatic) acid and a splash of high-strength hydrogen peroxide
(25% H2O2 can be bought at most health food stores). Once you've etched a
couple of boards in this solution, it starts to turn emerald green. I just
pour the solution (which I store in a 1-Litre brown bottle) into a pyrex glass
dish in my laundry-room basin, then I put on one rubber glove and swish the PCB
in the solution until it is etched. No heaters, no bubbling. It
takes about 3 or 4 minutes of swishing to finish the etching. It is pretty
gentle and doesn't over etch. I've used the same solution for six
years. I just occasionally add a splash of acid, and every time I add a
couple teaspoons of peroxide (which I keep in the second fridge in the laundry
room). Some of the solution sloshes out of the dish and goes down the
drain, or sometimes the bottle overflows slightly when refilling it after the
etch. Just flush it with some water from the tap. It won't hurt
your pipes, and it's not particularly noxious at the water treatment plant,
especially since only a few teaspoons of it are going down the drain. It
just contains a bit of cupric chloride.</FONT></SPAN></DIV><BR>
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<FONT size=2 face=Tahoma><B>From:</B> Synth-diy
[mailto:synth-diy-bounces@dropmix.xs4all.nl] <B>On Behalf Of </B>Chris
Juried<BR><B>Sent:</B> Thursday, March 03, 2016 2:50 AM<BR><B>To:</B>
Gordonjcp; synth-diy@dropmix.xs4all.nl<BR><B>Subject:</B> Re: [sdiy] Audio
circuits and basicelectronics knowledge recommendation.<BR></FONT><BR></DIV>
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<DIV id=yui_3_16_0_1_1457001560489_8521>That's the process I have been using
for some time now. I would like to get away from using ferric
chloride. </DIV>
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<DIV id=yui_3_16_0_1_1457001560489_8520> </DIV>
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<DIV id=yui_3_16_0_1_1457001560489_8507><FONT
id=yui_3_16_0_1_1457001560489_8522
size=2>Sincerely, <BR> </FONT></DIV>
<DIV id=yui_3_16_0_1_1457001560489_8505><FONT
id=yui_3_16_0_1_1457001560489_8508 size=2>Chris Juried <BR>Audio
Engineering Society (AES) <VAR id=yui-ie-cursor></VAR>Member
<BR>InfoComm-Recognized AV Technologist</FONT><SPAN
id=yui_3_16_0_1_1457001560489_8509 class=postbody><BR><A
id=yui_3_16_0_1_1457001560489_8541 href="http://www.juriedengineering.com/"
rel=nofollow target=_blank>http://www.JuriedEngineering.com</A> (Juried
Engineering, LLC.)</SPAN></DIV>
<DIV id=yui_3_16_0_1_1457001560489_8511><FONT
id=yui_3_16_0_1_1457001560489_8517 size=3><FONT
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<B id=yui_3_16_0_1_1457001560489_8555><SPAN style="FONT-WEIGHT: bold"
id=yui_3_16_0_1_1457001560489_8554>From:</SPAN></B> Gordonjcp
<gordonjcp@gjcp.net><BR><B id=yui_3_16_0_1_1457001560489_8557><SPAN
style="FONT-WEIGHT: bold" id=yui_3_16_0_1_1457001560489_8556>To:</SPAN></B>
synth-diy@dropmix.xs4all.nl <BR><B id=yui_3_16_0_1_1457001560489_8559><SPAN
style="FONT-WEIGHT: bold" id=yui_3_16_0_1_1457001560489_8558>Sent:</SPAN></B>
Thursday, March 3, 2016 3:17 AM<BR><B><SPAN
style="FONT-WEIGHT: bold">Subject:</SPAN></B> Re: [sdiy] Audio circuits and
basic electronics knowledge recommendation.<BR></FONT></DIV>
<DIV id=yui_3_16_0_1_1457001560489_8548 class=y_msg_container><BR>On Wed, Mar
02, 2016 at 11:37:58PM +0000, Chris Juried wrote:<BR clear=none>> I would
love to get my hands on a laser cuter for prototyping. Any idea what these are
running, on the entry level machines?<BR clear=none>> <BR clear=none><BR
clear=none>Laser cutters aren't great at making PCBs because copper is
shiny. What you want is a laser *printer*, some press'n'peel and a
couple of quid's worth of chemicals in a sealable tub like a Chinese takeaway
container.<BR clear=none><BR clear=none>-- <BR clear=none>Gordonjcp MM0YEQ
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