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

J. Forster jfor at quik.com
Sat Jan 9 22:49:07 UTC 2010


How about using ring counters? No decoder/drivers needed. A tube ring
counter, driving a Nixie directly.

-John

============
>
> 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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