On 1/9/10 12:09 AM, "Steve Rooke" <[email protected]> wrote:
2010/1/9 Tom Clifton <[email protected]>:
> 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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