[time-nuts] Digital Clock kit - no Integrated circuits!

[Norman J McSweyn]

I've actually got an EPUT with the prescaler good to 1GHz. Complete with 
manuals.
Too many BA's, not enough time..

Bob Camp wrote:
> Hi
> 
> 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?
> 
> Bob
> 
> 
> 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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> 
> 
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