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+===== **Through hole plating of PCBs by acid copper.** =====
+**Constant current, pulse and reverse pulse processes**
+{{:throughholepcb0.jpg|thumb|early attempt with powdered carbon for hole activation}}
+{{:throughholeplate1.jpg|thumb|sample after we figured out levelers and brightening}}
+{{:thourhgholeplated2.jpg|thumb|microscope shot of hole, after plating.
+The current calculation were a little off, hence the bumpy plating in the hole.]]
+{{:throughholeplate3.jpg|none|400px|caption}}
+{{:throughholeplate4.jpg|none|400px|caption}}
+[[http://www.flickr.com/photos/nullspacelabs/sets/72157625578867973/|More Pics]]
+[[http://www.flickr.com/search/?q=nsl+plating&m=tags|Pics tagged 'NSL plating']]
+====  Formula:  ====
+<code>
+ **Ingredients:**
+ .881 lb of crystal (CuS04)to each gallon of DI water
+ .4 gal 35% sulfuric acid (H2SO4)
+ .5ml hydrochloric acid (HCL)
+ PEG 10mg/L leveler (found as laxative at RiteAid)
+ Janus Green B as brigtner
+ **Tips:**
+ -Makes about 1.5gal
+ -Can push about 25amps per sqft but we have been using 8amp/sqft as the plating seems brighter and more level
+ -With a little agitation it seems we can push 10amps/sqft with out diminishing brightness.
+ -Light sanding after activation is very important (1000 grit sandpaper)</code>
+====  Power Supply  ====
+<code>
+ DIY TPM
+ http://www.dioda.ro/tutorial/TroughHole_MZingg/Welcome%20to%20the%20homebrew%20through%20plating%20machine.html
+ http://www.dioda.ro/tutorial/TroughHole_MZingg/Welcome%20to%20the%20homebrew%20through%20plating%20machine2.html
+ http://www.dioda.ro/tutorial/TroughHole_MZingg/Welcome%20to%20the%20homebrew%20through%20plating%20machine3.html
+ http://www.dioda.ro/tutorial/TroughHole_MZingg/Welcome%20to%20the%20homebrew%20through%20plating%20machine4.html
+ http://www.dioda.ro/tutorial/TroughHole_MZingg/Welcome%20to%20the%20homebrew%20through%20plating%20machine5.html
+ http://www.dioda.ro/tutorial/TroughHole_MZingg/Welcome%20to%20the%20homebrew%20through%20plating%20machine6.html
+ http://www.dioda.ro/tutorial/TroughHole_MZingg/Welcome%20to%20the%20homebrew%20through%20plating%20machine7.html</code>
+====  Concepts and Research  ====
+<code>
+ Pulse and pulse reverse plating—Conceptual, advantages and applications
+ {{:ea-v53-8-p3313.pdf}}
+<code>
+ Role of Additives in the Bright Copper Plating from Acid Copper Sulfate Bath and the History
+ {{:0611.pdf}}
+<code>
+ Aspect-Ratio-Dependent Copper Electrodeposition Technique for Very High Aspect-Ratio Through-Hole Plating
+ http://dx.doi.org/10.1149/1.2189238
+ The Theory behind Pulse Plating Reversal Current
+ {{:rp theory.pdf}}
+<code>
+ Prototype of the Pulse Plating controller.
+ {{:platingcontroller.jpg}}
+<code>
+ [[http://www.youtube.com/watch?feature=player_embedded&v=KTNuTv_IQp4|Another plating setup]]</code>