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Odd 7-segment display

(drives Q-H

7-segment

segment)

single-digit

a 16

drivers on

see each

Can I

available?

under

google

used

Ahh, yes, -when I was about 14 years old I built a digital clock out of TTL devices from a Popular Electronics plan, which would have featured Numitrons as the display elements. I made what must have been the ugliest printed circuit board ever - my school class used the Mactac and hobby knife approach for making PCBs, which gave incredibly crude results. Sadly, my troubleshooting skills were not up to overcoming my crude construction technique and I never got the darn thing to work - it wasn't until years later I found out the key difference between the 7447 display driver and the 7448 that the fellow at the electronics wholesaler sold me.

I may still have the Numitrons sitting in the basement somewhere..

Bill

Reply to
Bill Shymanski
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John Popelish sez:

And I, appreciating your many contributions to posted questions, will endeavour to make my questions as memorable (in a good way) as possible (c:

Eminently logical.

--
John English
Reply to
John E.

This conversation has been such a nice change from the flame wars I see here, so often. And it is a pleasant experience to finally meet a Vulcan. ;-)

Reply to
John Popelish

On Sat, 17 Feb 2007 01:37:01 -0500, John Popelish Gave us:

Yeah! So there!!!

I guess I'm a Vulgan ;-]

Reply to
MassiveProng

Perhaps you should try to get the thing working now that you're armed with more knowledge? If you find the Numitrons and would like to get rid of them I'd happily give you something for a set. I build clocks using odd old display devices.

Reply to
James Sweet

Do you have a web site or a link to some pictures? I collect clocks, watches and all things horological and am also interested in constructing unusual time pieces.

Reply to
Anthony Fremont

Most drivers for LED displays (CA3161 etc) have the resistors built in for direct connection. But you should check the data sheet for your particular one.

--
*Forget the Joneses, I keep us up with the Simpsons.

    Dave Plowman        dave@davenoise.co.uk           London SW
                  To e-mail, change noise into sound.
Reply to
Dave Plowman (News)

I don't, but if you do a search for nixie clock gallery you can find pictures of all sorts built by other people.

Reply to
James Sweet

Since I dug my PIC stuff back out the other day, I've been tinkering around with something I've wanted to do for a while. It's sort of a variation on the propellor clock but with a pendulum, so back and forth not around. I'm able to strobe out messages on a column of LEDs, but I'm not sure a pendulum (even a short one) is going to swing fast enough to give a very readable display. I may have to switch to a ceiling fan version. ;-)

Reply to
Anthony Fremont
.

It works if the size is small, you can buy these ready made at Target and similar stores. They use an electromagnet to oscillate the pendulum which is about 6" long and very light weight.

Reply to
James Sweet

if the pendulum is short enough (about 1" to centre of mass) it should swing fast enough with gravity alone

Bye. Jasen

Reply to
jasen

Incandescent, but not Numitron ... I think. ISTR that Numitron displays were packaged in glass envelopes, like the Nixie or your garden variety "valve" (tipping my hat to Brits), and were designed to stand upright. Your device, on the other hand, is 16-pin DIP.

I have a handfull of these things, purchased new circa 1972 from a small "TTL chips and stuff" mail order company in Missouri (if memory serves) for use in the second digital clock I had designed. (First clock used Nixies) Nixies turned out to be way too bright though, and there were no inexpensive 7-segment LEDs back then. The incandescent wires drew a low of current, and 6 displays required a robust p.s., so I replaced these displays with LEDs as soon as the latter became available.

The incandescent displays I have are not marked with a manufacturer's name, just "8-43-19" silk-screened in white paint on one side of the black case.

Reply to
Michael

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