Homebrew PCBs

"Andrew" <andrewm1973@...> writes:
> I think until I get spray etching happening I will
> just stick to Ferric Chloride on boards with <8 thou
> dimensions.  The CuCl just undercuts more from
> my expereince.

Another thing is to try 1/2 oz copper - half the undercutting, half
the etch time, etc.

> (And I will probably be one of the people you
> scream at for doing heavy symbols)

Not me :-)

> Going to give your teardrop plugin a go as soon as
> I have drawn a real PCB.

I found that useful for hand-etched, in case the drills are off.

> Down at this size the imperial back end that only went to 1000ths
> made things frustrating.

We changed PCB from 0.001" to 0.000010" resolution for similar
reasons.

> That last 0.05mm makes a difference.

See http://www.delorie.com/pcb/first.html for a 0.4mm pitch part,
hand-etched with 1/2 oz TT, with 01005 caps.