ComputerVoltageSources

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.)
>