Homebrew PCBs

Cathode current density (C.D.) normally between 10 ~ 20 mA/sq.cm.
Are you getting hydrogen from the PCB ?
If so then C.D. is too high or copper too low.

To check approx. copper sulfate concentration make up a test 
solution of your desired concentration (e.g. 80 g/L CuSO4.5H20) 
and put it in a test tube. Then take sample of plating solution 
and put into a identical test tube and fill to equal height. Look 
though the end of each test tube and compare the color.
This will get you +-20% accuracy which can be good enough.



roel_cnc wrote:
> Hi,
> 
> I'm trying to get me bath plating but it isnt working as it should be!
> only thing i got is a dark brown easely wipe of film
> pcb is 10 sq cm power supply gifs 1,8 volts ad 0,7 amps
> also tryt a 5 volt make same result only faster 
> have to tell the bath solution is made as adam's style with a 
> terracotta pot - acid is pritty blue
> 
> gr. Roel
> 
> 
> 
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