Homebrew PCBs

Very nice site!  It would have been very helpfull when I was trying CuCl.

One question, you have a chart that shows AP as generally having about
1/4 the etching rate of CuCl and worse than 1/5 the rate of FeCl for a
given temperature.  What was your AP concentration?  My experiences
with AP and FeCl are significantly different from that.  Just
yesterday I etched a 2.5"X3.5" DS 1 oz board in 5 minutes.  1 L of AP
(250G/L per the directions on the package) heated to about 45C.  This
etchant is getting a bit old - I've done about 10 similar sized boards
in it so it may even be faster with fresh etchant.  This was
significantly faster than the FeCl etching that I have done at room
temp (12-14 minutes at 25C approx from memory).  I recall room temp AP
took a little longer than FeCl but not appreciably.  I'm mostly
curious since I'm very happy with AP.

Phil


--- In Homebrew_PCBs@yahoogroups.com, Adam Seychell <a_seychell@y...>
wrote:
> Hello,
> 
> I have finally got around to writing up a web page describing the
things 
> I've learned about cupric chloride etching at home (also having fun
with 
> my digital camera). This is pretty new, so I expect to find some things 
> that will need changing. Criticizes are welcome. I hope its useful to 
> somebody someday.
> 
> http://members.optusnet.com.au/~eseychell/PCB/etching_CuCl/index.html