Mystery Nixie? Desk Clock?

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2 weeks 5 days ago #10287 by JIMO
Replied by JIMO on topic Mystery Nixie? Desk Clock?
Yes, they are fun to play with and I assume you mean the TTL BCD to 7 segment driver, the 7447 or more interesting, the 74247 (puts tails on 6 and 9) ic's that are intended to drive numitrons and do it in a sinking way. Current limiting with this chip is needed when driving LED displays which could also be tedious with individual resistors if designing that way. You mentioned multiplexing and the clock in discussion above uses a multiplexing driving design and in fact has all the diodes, one for each segment, that you mention, but technically no cathodes in a Numitron :) . They are incandescent and conduct current in both directions. If you like, see JIMO415 on YouTube for more detail and cool vintage clocks.
Enjoy,
Jim

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2 weeks 5 days ago #10288 by notfaded1
It's actually kinda funny I said cathodes... Same idea though.

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1 week 4 days ago #10339 by Ian
Replied by Ian on topic Mystery Nixie? Desk Clock?
I'm on my way to pick up a quantity of DA-2000s at the weekend. If anyone is interested in having some, I could probably let some go...

I'm also planning to make a DA-2000 clock in the near future.

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1 week 3 days ago #10342 by jonboy
Replied by jonboy on topic Mystery Nixie? Desk Clock?
Hi Ian,
I will ask the question for everyone, how much will they be for 4 or 6??
Also I have seen DA-2000’s with both straight edges at the top or rounded tops.
Which ones do you have?
I have always like the look of these bulbs, but they have always been out my price range!
Thanks
Jon

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1 week 3 days ago #10343 by Ian
Replied by Ian on topic Mystery Nixie? Desk Clock?
I'll post some photos when I get home, but they are are square top ones.

However they will be fairly affordable: in any case well under $10 each to people here.

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1 week 3 days ago #10344 by notfaded1
I'm 100% on board with building a numitron with DA/DR20x0 tubes. I have many and I'll also buy. Here a video of my first test running a tube myself from scratch. I can set the level of each segment individually



Bill

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