Mystery Nixie? Desk Clock?

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11 months 1 week ago #9026 by Ty_Eeberfest
I don't think anybody cares if we take the thread off topic, especially since the OP has not been here in years.

The clock kit was made and sold by IC Electronics in Orange, CA. IC was a small single location parts distributor / retailer that seemed to specialize in supplying small lots of hard to find (at the time) components to people developing prototypes. Plus a little bit of surplus stuff (like those 60 cent B-7971s). The owner made up some boards and sold them with a bag o' parts from his stock as a clock kit. Basic MM5314 + LED displays design. I doubt more than a couple dozen were ever sold.

I found your YouTube channel and looked at a bunch of your videos. You have an interesting collection of old equipment. The TTL clock looks great! Very clean job on the circuit boards. Nice to see you made the effort to work out your own circuit design instead of just duplicating some app note schematic.

Look into it later when the dust is clearing off the crater.

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11 months 1 week ago #9028 by JIMO
Replied by JIMO on topic Mystery Nixie? Desk Clock?
Thank you for the complements. I have to say, I did alot of poking around on the net for help. The data book was also a help, which I happen to have from school days. (1992 or so). The 1 to 12 counter was a huge hurtle. The 7490 resets to zero and I could not figure put how to trick it to jump to one with the whacky 0-9 and 1-2 count needed for the hours position. So I used flip flops because I found info on someone doing this. But it did not work, I did make changes and figured it out. The time setting is my own doing and using button debouncing techniques. I learned alot on this project last year.

The mechanical equipment in my videos was my passion for years but I now have physical limitations which is why I swayed to clocks. Just dealing with bad carpal tunnel right now so I am slowed with that. It is easier to repair old production clocks than build from scratch right now.

thank you for the interest.
Jim

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5 months 6 days ago #10139 by JIMO
Replied by JIMO on topic Mystery Nixie? Desk Clock?
To finish this story, I did find another example of the same clock that the original poster had started this thread with. It has an early MM5314N with a 1972 date code with gold pins and 1973 dated RCA tubes.

Attachments:

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5 months 2 days ago #10140 by jonboy
Replied by jonboy on topic Mystery Nixie? Desk Clock?
Numitrons are on the list for me to build a clock out of one day. I think they look very cool.
I notice in the picture the second numitrons are smaller than the minutes and hours, do you know what the make of each are?

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5 months 2 days ago #10141 by JIMO
Replied by JIMO on topic Mystery Nixie? Desk Clock?
The big ones are DR-2000 and the small ones are DR-2100 made by RCA. (Apollo / IEE brand tubes have a prefix of DA instead of DR and are the same). xx-2010 and xx-2110 tubes are basically the same except have a decimal point added in on the xx-2010's which you would not use. Some RCA 2000 / 2010 Numitron tubes have round tops which I like more but not sure if it was just the early runs or what.....

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3 months 2 weeks ago #10283 by notfaded1
They made both flat tops and round... to me the flat tops are harder to find. I have a large collection of DA and DR-2000 and 2010's. The great thing about numitrons is they only require 5V DC to run which, if you're into arduino, is pretty handy. One thing I've found out is using LED current sink driver chips from TI is pretty much the way to go. Also if you try to multiplex them you will get ghosting and the best way, although tedious, is to put a diode on every cathode.

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