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<div style="font-size: 10pt;"><div dir="ltr" style="margin-top:0;margin-bottom:0;">I really like the quality of etching with ammonium persulfate, but my main gripe is that it is quite temperature dependent, as is ferric chloride (to a lesser degree).</div><div dir="ltr" style="margin-top:0;margin-bottom:0;">I have etched boards and enclosures on the garden table, with the container (photo dev container) sitting in the snow, using muriatic and hydrogen peroxide.</div><div dir="ltr" style="margin-top:0;margin-bottom:0;">The etching is coarse, but for quick prototypes, adequate. It's been a long while though, lasercut frontpanels and iTead pcbs these days. Don't miss the drilling either.</div><div dir="ltr" style="margin-top:0;margin-bottom:0;"><br></div><div dir="ltr" style="margin-top:0;margin-bottom:0;">Regards,</div><div dir="ltr" style="margin-top:0;margin-bottom:0;">Jarno.</div></div><div style="font-size: 10pt;"><div id="LGEmailHeader" dir="ltr" style="margin-top:0;margin-bottom:0;"><div dir="ltr" style="margin-top:0;margin-bottom:0;"><br></div><div dir="ltr" style="margin-top:0;margin-bottom:0;">------ Origineel bericht------</div><div dir="ltr" style="margin-top:0;margin-bottom:0;"><b>Van: </b>David G Dixon<dixon@mail.ubc.ca></dixon@mail.ubc.ca></div><div dir="ltr" style="margin-top:0;margin-bottom:0;"><b>Datum: </b>vr, 4 mrt. 2016 22:00</div><div dir="ltr" style="margin-top:0;margin-bottom:0;"><b>Naar: </b><a href="mailto:okvern@ix.netcom.com">okvern@ix.netcom.com</a><a href="mailto:;synth-diy@dropmix.xs4all.nl">;synth-diy@dropmix.xs4all.nl</a>;</div><div dir="ltr" style="margin-top:0;margin-bottom:0;"><b>CC: </b></div><div dir="ltr" style="margin-top:0;margin-bottom:0;"><b>Onderwerp:</b>Re: [sdiy] Audio circuits and basic electronics knowledgerecommendation.</div><div dir="ltr" style="margin-top:0;margin-bottom:0;"><br></div></div><pre>Ammonium persulfate is a strong oxidant. It dissolves copper by oxidizingit to the cupric state thus:(NH4)2S2O8 + Cu --> CuSO4 + (NH4)2SO4A byproduct of the reaction is ammonium sulfate, which is a <a href="http://fertilizer.Th">fertilizer.Th</a>is is very simple and effective chemistry, and I suspect that it is themost efficient and easy-to-use etchant system. However, it's also a littlebit costly. > -----Original Message-----> From: Synth-diy [mailto<a href="mailto::synth-diy-bounces@dropmix.xs4all.nl">:synth-diy-bounces@dropmix.xs4all.nl</a>] > On Behalf Of Olav Martin Kvern> Sent: Friday, March 04, 2016 11:01 AM> To:<a href="mailto: synth-diy@dropmix.xs4all.nl"> synth-diy@dropmix.xs4all.nl</a>> Subject: Re: [sdiy] Audio circuits and basic electronics > knowledge recommendation.> > Hi David [Dixon],> > re: alternatives to Ferric Chloride> > I've been using Ammonium Persulphate for years, based on a > photo-process writeup that Ray Wilson used to have on his > site. This works amazingly well, and I much prefer it to > Ferric Chloride. Any comment on the chemistry of this approach?> > Thanks,> > Ole> _______________________________________________> Synth-diy mailing list><a href="mailto: Synth-diy@dropmix.xs4all.nl"> Synth-diy@dropmix.xs4all.nl</a>> <a href="http://dropmix.xs4all.nl/mailman/listinfo/synth-diy_______________________________________________Synth-diy">http://dropmix.xs4all.nl/mailman/listinfo/synth-diy_______________________________________________Synth-diy</a> mailing<a href="mailto: listSynth-diy@dropmix.xs4all.nlhttp"> listSynth-diy@dropmix.xs4all.nlhttp</a>://<a href="http://dropmix.xs4all.nl/mailman/listinfo/synth-diy">dropmix.xs4all.nl/mailman/listinfo/synth-diy</a></pre></div>
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