[time-nuts] Digital Clock kit - no Integrated circuits!
Norman J McSweyn
normn3ykf at stny.rr.com
Sat Jan 9 16:12:49 UTC 2010
I've actually got an EPUT with the prescaler good to 1GHz. Complete with
Too many BA's, not enough time..
Bob Camp wrote:
> I *think* I still have a case of gas filled dual triodes sitting in the shed. The Beckman EPUT meter used them in the decade divider / display sections. I don't have any of the meters any more, but I do have the spare parts for them. Go figure ....
> They actually make pretty good low speed logic gates.
> Tube based clock driving neon bulbs for the display anybody?
> On Jan 9, 2010, at 10:30 AM, Lux, Jim (337C) wrote:
>> On 1/9/10 12:09 AM, "Steve Rooke" <sar10538 at gmail.com> wrote:
>> 2010/1/9 Tom Clifton <kc0vsj at yahoo.com>:
>>> http://transistorclock.com/ has a very interesting (though a bit expensive) kit for sale. A 10" x 11" circuit board sporting nearly 200 transistors and 600 diodes to drive six seven-segment displays. Suitable for framing... As delivered runs on 60hz but there is a note about conversion to 50hz mains. You can buy a bare board, just the components or a full kit.
>>> You must see it to believe it!
>> Bah humbug! Stupid modern day design, it'll never be any good, you
>> need to use valves to make real gear :-)
>> Well, they do make dual triodes which are convenient for making those Eccles-Jordan circuits.
>> I can't help wondering if you go do better than the 4 bit counter:4-10 decoder:10-7 decoder. Yeah, simple diode matrices in an AOI configuration are easy, but surely a bit of work (as in digging up archaic designs) could find a "lower part count" approach. Time to use that Karnaugh map.
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