Re: [time-nuts] KSC big clock

2016-10-21 Thread Adrian Godwin 
Wow .. 24kW for a clock display !


On Fri, Oct 21, 2016 at 6:56 AM, Todd Caldwell  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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>>
>
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Re: [time-nuts] KSC big clock

2016-10-20 Thread jimlux 

On 10/20/16 9:28 AM, Nick Sayer via time-nuts wrote:

This may be obvious, but anyone making such a device today would be well 
advised to use LED strips instead. We just upgraded the lighting in my wife’s 
office/craft room with an LED panel light. It’s around 4’x1’x1” and puts out 
4000 lumens - quite bright and enough to fill the entire room with task level 
lighting. You could certainly make the equivalent of a T8 bulb out of modern 
high output LEDs and they’d be able to be switched on and off solid-state and 
they wouldn’t suffer from frequent switching. Heck, you could probably 
multiplex them the same way you multiplex smaller LED displays and it would 
still work.

You can buy, made by Philips, a direct replacement LED unit that will 
install in place of the flourescent tube. Looks like a tube, just has 
lots of LED inside.



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Re: [time-nuts] KSC big clock

2016-10-20 Thread Nick Sayer via time-nuts 
This may be obvious, but anyone making such a device today would be well 
advised to use LED strips instead. We just upgraded the lighting in my wife’s 
office/craft room with an LED panel light. It’s around 4’x1’x1” and puts out 
4000 lumens - quite bright and enough to fill the entire room with task level 
lighting. You could certainly make the equivalent of a T8 bulb out of modern 
high output LEDs and they’d be able to be switched on and off solid-state and 
they wouldn’t suffer from frequent switching. Heck, you could probably 
multiplex them the same way you multiplex smaller LED displays and it would 
still work.

> On Oct 20, 2016, at 2:51 AM, 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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> time-nuts mailing list -- time-nuts@febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.

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[time-nuts] KSC big clock

2016-10-20 Thread Blair Lade 
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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