Homebrew PCBs

> Steve wrote:
> 
> The pictures I "fixed", however, are of using the
> photo emulsion that normally goes on the screen,
> right on the board as the etch resist. I think
> the idea is that it is supposed to be a lot cheaper
> than normal PCB photosensitive etch resist.  Not
> having priced the two, I don't know. In that
> particular case, the gentleman involved I think was
> unable to find conventional photosensitive PCBs or
> coating in his country.

If you have a brother in law that works in a screen
printing shop then the diazo stuff might be cheaper.

If you are comparing the price of diazo stuff with
something like kodak KPR then screen printing is
cheaper.

If you are comparing prices of buying small bottles
of diazo screen printing emulsion from your local
art/hobby shop with pre sesitised boards then it
looses.

I have to pay $60 (AUD) for a little bottle of the
diazo stuff from an art shop.  I pay $3 (AUD) for
a 100 x 150mm PCB with dry film already on it.

That said - I might try it just to see how good a
result can be acheived.  That is when I have spare
time :(