[sdiy] PNP Blue questions

[Matthew Smith]

Quoth aankrom at 24/04/12 08:38...
> So, I shouldn't just set up several patterns to fill the sheet of PNP
> and run it through the printer?

Before I started sending board designs off for professional production, 
I used a photographic process.  The special paper I used to print the 
images (a bit like posh tracing paper) was quite expensive so, yes, I 
would wait until I had several designs, and fill up as much as I could 
before running through the laser printer.

Oh, and I used ammonium persulphate as an etchant. Unlike ferric 
chloride, which is yucky yuck epitomised, it's easy to see through, so 
no problem seeing how far the etch has progressed. Also used a bubble 
etch tank, which was WAY easier and quicker than using a rocker dish 
(and it's temperature-controlled.)

-- 
Matthew Smith

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