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

[Steve Rooke]

2010/1/9 Morris Odell <vilgotch at bigpond.net.au>:
>
> From: Steve Rooke <sar10538 at gmail.com>
> Subject: Re: [time-nuts] Digital Clock kit - no Integrated circuits!
> To: Discussion of precise time and frequency measurement
>        <time-nuts at febo.com>
>
> 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 :-)
>
> Not only do I have a 5245M but no less than TWO HP 524 counters. One's a "B"
> with 88 valves, 6 neon columns and 2 meters for the last 2 digits, the other
> is a "D" with a similar number of valves and, yes, 8 Nixies. They are driven
> 5245 style with neons & photoconductors.
>
> When the 2 coutersaurii are going and their output waveforms are being
> compared on the Tek 555 scoposaurus there are about 300 valves glowing away
> and about 2.5 kW being dissipated. Definitely not to be done during the
> Australian summer - 39C here today.

Sounds like you need to take the covers off and mount them on the
wall, That'll show them new age transistor guys what's what, let alone
those people who seem to like those large transistors with dozens of
legs!

Seriously though, that must be a sight to see, I'd love to pop over
the pond to the West Island where you live and have a look at this
piece of engineering but then again I'd love to have the money to be
able to do that in the first place.

Well, you can keep your 39C thank you very much, I'm a Brit and would
die in such torrid conditions methinks. When it gets warm here it's
round me Mum's and on with the A/C despite her protests about being
cold :-)

Steve

> Morris
>
>
>
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-- 
Steve Rooke - ZL3TUV & G8KVD
A man with one clock knows what time it is;
A man with two clocks is never quite sure.