Homebrew PCBs

brainlessbill wrote:
> 
> Hello All,
> I'm new to the group, and still a beginner at homebrew PCBs, so I'll
> introduce myself by hammering you all with a tough one (for me,
> anyways).  I recently bought a couple of LCDs with Horz-Bottom SMD
> connectors (I should have read the not-so-fine print).  The pins
> are .2mm wide on .5mm centers. Does anyone have a technique to etch
> these fine traces?  So far I have only tried photoetching using
> transparencies and my Brother HL1240 printer, which leaves a few
> pinholes that I can't fill in.  Also, the ferric chloride seems to
> undercut some of the resist that does remain after exposure.
> 
> Any pointers would be appreciated.  I had planned on using the LCDs
> for debug readouts for a PCB mill that I am building.

There's plenty of info in previous messages about getting
sharp 0.2mm traces using epson inkjet printers and transparencies.
I've done 240pin pqfp chips with 0.5mm lead spacing like that.