Homebrew PCBs

Stefan, Thanks for the ideas on H2O2. 
My solution is still light green after 1 time use. I only saw some 
light bubbling after mixing, and soon there were no bubbles.
I will try and locate the 35% Peroxide and add a few drops to re-
activate.

The other drilling and exposure ideas I have seen are very helpful!
The exposure with sunlight for 25-35 seconds may be the simplest, 
but I'm not sure if clouds or season will affect results?
If exposure time varies, then I'll try the Derma-Spec to gain more 
control (at the expense of speed). 
I can add a heat sink? or even replace the whole ballast control 
section easily (I hope).

I think the Dremel attached to HF drill press idea would be ok, but 
the chuck/quill would need to be locked to prevent spinning? Or 
still I must hold by hand.

I REALLY liked the elegant/simple Laptop Drill press that Jankok 
posted in the photos section!
Thank You very much for sharing!

I will use that idea with the Dremel tool. It's just too easy to 
make!
I want to try gravity feed w/adjustable stopper block and handle so 
that I can actually rest the drill point on the hole for more 
accurate positioning.
Maybe I need to add some counter-balance or spring to lighten the 
weight of the tool?
If I do the woodwork carefully (to minimize play in the arm), Will 
it work to rest the drill on the board before starting the motor 
with a footswitch?.
This setup could be ideal for DIY board makers!

Thanks to everyone for their ideas! This is a fun hobby, and I have 
learned quite a lot from your helpful posts!

Best Regards,
Byron


> if it turns from light green to dark green/brown (when shaking the 
> container gently normally)
> you need some more h2o2, with 35% stuff and a small board only a 
few drops 
> are needed.
> 
> 
> the problem:
> 
> after using the etchant the amount of h2o2 still in the solution 
causes it 
> to get light green.
> when you fill it in a bottle and use it next time it is still 
light green.
> but the speedup from the h2o2 is not there (it has disintegrated 
in the 
> meantime).
<snip>
> get yourself some 35% h2o2 at a chemicals shop. (maybe good 
drugstores have 
> it - here they have).
> it is very cheap and you need MUCH less...
> 
> regards
> stefan