[time-nuts] Digital Clock kit - no Integrated circuits!
lists at cq.nu
Sat Jan 9 15:45:25 UTC 2010
Maybe a system using a rotary electrical machine synchronous to the power line driving a system of gears. and pointers on a dial
If the transistor clock is worth $200, I should be able to sell something like that for $400. Throw in the alarm buzzer feature and it could go for $600...
Off to Walmart to stock up and make my fortune ....
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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