[time-nuts] KSC big clock
artgodwin at gmail.com
Fri Oct 21 04:35:55 EDT 2016
Wow .. 24kW for a clock display !
On Fri, Oct 21, 2016 at 6:56 AM, Todd Caldwell <tmcaldwell at pobox.com> wrote:
> Hi All,
> I've been lurking and assembling gear for the most part, so this is my
> first post I think.
> I was at KSC in May of 2010 for the launch of STS-132. Attached is a
> relatively closeup pic of the old countdown clock near the press area. As I
> recall, the bulbs are 100W incandescent. LOTS of them.
> Sadly, they've replaced it with a HDTV like setup of some kind since.
> Video would have been nice I suppose, but the old clock had character.
> Todd - K5SLR.
> On 10/20/16 04:51, Blair Lade wrote:
>> The KSC clock might just use fluroscent tubes in a 7 segment display
>> configuration.Pretty easy to do, just put a set of relay contacts inplace
>> of the starter in the circuit, close the contact, fluro turns off, current
>> flows through heater / filiment keeping them warm.Open the contact, fluro
>> lights..Drive relays off bcd to seven segment decoders, etcWhile it's a bit
>> nasty on the fluro tubes when in the off condition, they are cheap..and the
>> duty cycle isnt all that bad.In actual practise, the relays suffer more
>> than the tubes, and they are cheap too!
>> Blair South Australia
>> Sent from Samsung tablet.
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