Homebrew PCBs

> > Never heard about the conductive glue, but it sees to work pretty well. 10 mils is not bad, It will be perfect to me when they get 6 mils resolution, vias and multilayer, but it is a very interesting 
> beggining. It also has pick and place!
> 
> Did you see the part on conductivity?
> 
> >> After drawing the line shown above (1cm x 8cm), we measured 0.7 ohms of resistance.
> 
> Now calculate the resistance of those 10 mil traces.
> 
> -p.
> 


I'd be doubtful of the 0.7 ohms measurement, that meter wouldn't be accurate enough for that small a reading.  Plus you'd need to know the thickness - I'm assuming they know that but it still needs to be mentioned (and used in the calc as obviously thicker = lower resistance).

Googling around for the figures for membrane switches gives their 0.0875 ohms a bit high by comparison, but not by much.  People quote anywhere from 0.01 - 0.06, more silver = lower ohms.

As someone mentioned it'd work ok for digital circuits.

At least it's quieter than milling.

A thought that just occurred to me - if they're using an inkjet cartridge, why not use a printer for the first step?  (Speed maybe?  Printer too fast?)

Tony