Looking for a clock project from the 1970s

[Mitch]

Around 1973 I build a clock from what I think was a magazine article. I've been looking for that article for years. I've searched archives with no luck. Here is the description:

The clock was point to point wired on two stacked pieces of breadboard, around five inches square each. It included two incandescent seven segment displays on the top board, and was built with 7400 series ICs. It flashed hours, minutes, and seconds.

Does anyone remember this project? I may have asked this question years ago. Thanks in advance. Mitch

[Instrument Resources of America]

Just a wild guess on my part, due to the topic, and the year, but could it have been a Pop Tronics (Popular Electronics) article?

Ira

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[Peter Csaszar]

Well, maybe you'll just have to design it from scratch yourself. :-) The jury is still out though whether the Numitorns can be driven from a regular TTL (or LSTTL) output. One opinion is that they can, as long as there is a diode in series with the Common, to lower the voltage on the filaments a bit. Another concern is the inrush current when a cold filament is lit up, jeopardizing the output driver of the IC - but based on some accounts, it is not a real problem.

[Mitch]

I believe that I searched those archives. Thanks for the suggestion. I'll try again.