Need a suggestion

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10 years 5 days ago #27 by Stuckey
Need a suggestion was created by Stuckey
I have a half a dozen of these panaplex-style displays coming and one larger one (4 inches tall)

I was thinking about making a single digit clock out of them but I can't seem to find a good starting point. Most nixie clocks don't use 7 segments and VFD/Numitron clocks are too low voltage.

Short of engineering my own solution, does anyone else have any ideas?

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10 years 5 days ago #28 by Stuckey
Replied by Stuckey on topic Re: Need a suggestion
And here is the other one:

"If the laws of physics don't apply in the future, then god help you."
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9 years 11 months ago #85 by whoopjohn
Replied by whoopjohn on topic Re: Need a suggestion
I have a good single tube clock driver PIC, with cross-fade and tumbling dice routines. it would be a simple matter to use diodes to select whichever segments are required to be lit for each digit, from the 0-9 outputs.

You would just need a MPSA42 per segment.

Some of these multi-segment panaplex-style displays like a different current per segment, so you may need to experiment with a resistor per segment on the cathode side, as opposed to/or in addition to a single anode resistor, if you see uneven illumination.

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9 years 11 months ago #95 by AnubisTTP
Replied by AnubisTTP on topic Re: Need a suggestion
If you want to make these work with a commodity Nixie clock uC, you could try to scrounge up a Beckman DD700 driver chip. These are like some mutant fusion between a 7441 and a 7448, they take a BCD input and can control a seven segment Panaplex display. I am not sure if they can handle the current draw of a large display like the NEO5000 but they are not that hard to get if you only need one chip... just buy an old Panaplex panel meter from somewhere and scrap the controller, almost all of them use a DD700 or a similar Beckman part, and you can sell the display from the scrapped meter after-wards and get most of your money back.

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9 years 11 months ago - 9 years 11 months ago #96 by whoopjohn
Replied by whoopjohn on topic Re: Need a suggestion
AnubisTTP wrote:

just buy an old Panaplex panel meter from somewhere and scrap the controller, almost all of them use a DD700 or a similar Beckman part...

Yes that would certainly work. I made a clock using a Beckman panel meter like you suggest. It had three DM880s on-board, so I used them. I used a simple 555 timer switcher for the high voltage. Way less picky than the MAX1771.
Here's a picture:

A little more information on my web page here:
Panaplex clock
Last edit: 9 years 11 months ago by whoopjohn.

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