Homebrew PCBs

Snip
> That is the disadvantage of the "home-
> brew" point-of-view. When you want to go like the pros, nobody seems 
> interested. By the way, with a home-build spray ecthing system I was 
> able to etch an 30x30 cm double-sided board in 4 minutes with ferric 
> chloride at room temperature, with excelent resolution.

Most Home-brew-ers like to KISS or Keep It Simple Sam. A simple bubble 
etch tank with an aquarium tank air pump using a 300ml etch solution of 
1 part ~30% HCl and 2 parts 3% H2O2 can etch a 6" * 9" board in about 3 
minutes. This set up involves no heating of the chemicals, no pumps, no 
electronics to control the spray nozzel pattern, and no spray mist. 
This set up provides crisp lines, with out the mess. Sure a spray tank 
is nice for production runs with multiple boards at a time, but as a 
home-brew-er KISS works for most.