RE: LCD display
4 pins would be Ground, TXD, Reset amd +5 volts, is that correct?
The voltage regulator is only a TO-92, don't plan on powering the LCD if it draws more
than 25 ma.
RE: Magic Eye Tubes
OK, this time around I am going to buffer the DAC reference with an op-amp. I'll put a
copper pad on the reference op-amp output.
If you use the buffered reference pad as ground, then the DACs will go from zero to -10
volts relative. That will support the Magic Eye Tubes with a zero to -8 volt control range.
The 250 volt B+ supply is your problem. My only request is that you publish a picture of
the finished display (if you do this crazy thing).
--- In ComputerVoltageSources@yahoogroups.com, "djbrow54" <davebr@...> wrote:
>
> Two comments. First, I'd go with a 4 pin interface. I think there
> should be a ground and it would be nice to tie the resets together.
> You can do them independent but you have timing issues on power-up not
> knowing which processor is active first (although the displays take
> some time to initialize.
>
> On the subject of Nixies ... my other hobby is vintage radio, from the
> late teens until about 1940. While I still have a stash of Nixies,
> you really want tuning eye tubes on each of the CV outputs. The
> 1629 versions are still pretty plentiful as military NOS. It's also
> easier to punch the round holes for them in the panel. You think I'm
> kidding, don't you ...
>
> http://www.radioremembered.org/tuneye.htm
>
> Dave
>
> > ----- Original Message -----
> > Actually, it appears (no pun intended) that the display will
> > require nothing more than a 2-pin interface on the main board
> > So, people will be free to design Nixie displays if they really
> > want to. (I ∗think∗ it was a joke... though I love
> > Nixies, too.)
>