Hey there, beautiful people!
I decided I'd develop a modern driver for Display Systems eggcrate displays... which I have some on hand, as I found a good supplier in Omaha that sells them cheap.
$75 a 19S-8 eggcrate digit from the surplus shop is better than $100 a 602L vane digit brand new from ScoreTronics!
What I did for my controller design was ignore the use of dollar signs, as some digits, if you try to ground Molex pin 12 to light a dollar sign, would short the 28V supply if there is no dollar sign support.
So, I used a CMOS IC pair... a CD4028 to convert BCD to raw decimal, and a CD4510 to handle parallel inputs, carry, and latching. A CD4511 would branch off to a small LED display for diagnostic purposes, and a TIP127 on each decimal output would invert the signal from
HIGH to
LOW and handle the high power 28V line. The rest of the electronics run off of 12V. I'd simply run a separate 28V line through a buck converter to drop the voltage down.
Here's an image of how a prototype board is going so far. I just have to wait for the tube of LED displays to come in from China to solder one in and test the board.
Hope you guys like the idea as much as I did!
P.S. I designed this for a custom display using eggcrates.