[sdiy] Audio circuits and basicelectronics knowledge recommendation.

[David G Dixon]

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.


  _____  

From: Synth-diy [mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of
Chris Juried
Sent: Thursday, March 03, 2016 2:50 AM
To: Gordonjcp; synth-diy at dropmix.xs4all.nl
Subject: Re: [sdiy] Audio circuits and basicelectronics knowledge
recommendation.


That's the process I have been using for some time now. I would like to get
away from using ferric chloride. 
 
Sincerely,   
  
Chris Juried  
Audio Engineering Society (AES) Member  
InfoComm-Recognized AV Technologist
http://www.JuriedEngineering.com <http://www.juriedengineering.com/>
(Juried Engineering, LLC.)


This e-mail, and any attachments thereto, is intended only for use by the
addressee(s) named herein and may contain legally privileged and/or
confidential information. If you are not the intended recipient of this
e-mail, you are hereby notified that any distribution or copying of this
email, and any attachments thereto, is strictly prohibited. If you have
received this email in error, please immediately notify me at (754) 300-9972
and permanently delete the original and any copy of any e-mail and any
printout thereof.




  _____  

From: Gordonjcp <gordonjcp at gjcp.net>
To: synth-diy at dropmix.xs4all.nl 
Sent: Thursday, March 3, 2016 3:17 AM
Subject: Re: [sdiy] Audio circuits and basic electronics knowledge
recommendation.


On Wed, Mar 02, 2016 at 11:37:58PM +0000, Chris Juried wrote:
> I would love to get my hands on a laser cuter for prototyping. Any idea
what these are running, on the entry level machines?
> 

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.

-- 
Gordonjcp MM0YEQ 


_______________________________________________
Synth-diy mailing list
Synth-diy at dropmix.xs4all.nl
http://dropmix.xs4all.nl/mailman/listinfo/synth-diy




-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://synth-diy.org/pipermail/synth-diy/attachments/20160303/2f88130c/attachment.htm>