I've been thinking for a while (since 2003) that a flex board would be a
nice way to make the origami circuitry you'd need for a truly compact
Nixie watch.
http://www.cathodecorner.com/nwl-render/nwla6pcba.png
It's nowhere near done, so don't worry about the parts that don't quite
fit.
The light blue lines are fold lines. The two segments on the right side
fold against each other to make a wall; the pushbutton switches face the
right side of the case. A narrow rib exists in the case front to stop
the board from moving when the buttons are pressed. It contacts the
blank area to the right of the CPU chip.
The power supply folds up over the bottom of the tubes with the
transformer tucked between the two sockets. I found that there are
low-profile 2mm SMT sockets available - they make the assembly go a lot
faster than the Mill-Max pins I've been installing one by one.
The 200 mAH battery fits on the left side, taking up space equal to the
stuff on the right side.
The USB charging socket is angled to match the curvature of the side of
the case. The main board behind the tubes is stuck to the case back with
double-sticky tape to keep things from moving around.
We'll see if this design survives its sanity check.
--
David Forbes, Tucson AZ
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