Homebrew PCBs

Anthony Toft wrote:

> How important is the 1 amp? Do I have to limit it to 1 amp or will it
> draw up to one amp?
> 
> My power supply will deliver about 20amps at 5 volt (recycled computer
> PSU) so I am going to need to put a resistor in there it limit it.
> 


   With just 5 volts mine only drew 300 to 400 ma or so.  Then I bridged 
the + and - five to get 10 and got 800 to 1000 ma.  I also only used 1 
nail on each end, using more would expose more surface and likely allow 
more current, and you can also only put the nails in so far to limit. 
Don't think you need to worry about the resistor, just put your meter on 
amps and in series so you can see what it's drawing and you'll get the 
hang of it as you move the nails around.

   Now I have to make a board to see how much better it etches, it was 
getting a bit slow on the last one.

Alan