Thats some pretty fine etching there.
Daryl.
--- In Homebrew_PCBs@yahoogroups.com, DJ Delorie <dj@...> wrote:
>
>
> I finally collected enough bits and pieces to do CuCl etching
> (although it's still HCl etching). I've been collecting stuff for
> quite some time now, HCl, H2O2, NaOH, beakers, etch tank,
hydrometer,
> etc. Also built a separate chemistry bench with a vent fan and
sink.
>
> I also took the time to do a "print survey" of all my laser
printers
> (I've got three functioning ones at the moment) and toner
cartridges
> (three for one of the 4P's) to find the best one. Turns out the
old
> HP 4P produces much crisper prints than the new (and faster) HP
2550.
> I suspect it's a combination of "black only" and "slower path".
>
> Anyway, I etched my bloat board, which I've mentioned here
before. It
> is just a grid of various line/space samples, with tweaks
> (bloat/shrink) to the lines to try to compensate for the process.
My
> goal was to get a reliable 5/5 etch, but I'm not quite there yet.
The
> solution is a faint green now! :-)
>
> The 6.67/6.67 rules seem to have worked reliably, although
everything
> was over-etched (new HCl solution). The 5/5 rules were barely
> passable if I shrunk the traces by a pixel (i.e. 3.33/6.67 rules).
> The regular 5/5 pattern had a few shorts in it. I haven't tried
> 5/6.67 rules yet.
>
> Photos at http://www.delorie.com/pcb/lab/
>