gEDA-user: liquid tin

[DJ Delorie]

> It's a beautiful layout DJ.  Like the minimally no-metal-surrounded
> pads.  Still Mystified by the big square one upper right.  Perhaps
> if is a large component land for heat flow?  but then why the
> reliefs?  Just to allow soldering?

U401 is an LM2595 switcher in a TO-263 package.  The big square is
where the heatsink tab is soldered down.  I plan on using the hotplate
to solder and desolder them, but in case I need to use the iron, I put
in thermals.