BL
Blair Lade
Thu, Oct 20, 2016 9:51 AM
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.
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.
NS
Nick Sayer
Thu, Oct 20, 2016 4:28 PM
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 blairl@bettanet.net.au 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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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 <blairl@bettanet.net.au> 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.
> _______________________________________________
> 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.
J
jimlux
Fri, Oct 21, 2016 2:16 AM
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.
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.
TC
Todd Caldwell
Fri, Oct 21, 2016 5:56 AM
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.
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.
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.
> _______________________________________________
> 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.
>
AG
Adrian Godwin
Fri, Oct 21, 2016 8:35 AM
Wow .. 24kW for a clock display !
On Fri, Oct 21, 2016 at 6:56 AM, Todd Caldwell tmcaldwell@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.
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/m
ailman/listinfo/time-nuts
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Wow .. 24kW for a clock display !
On Fri, Oct 21, 2016 at 6:56 AM, Todd Caldwell <tmcaldwell@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.
>> _______________________________________________
>> time-nuts mailing list -- time-nuts@febo.com
>> To unsubscribe, go to https://www.febo.com/cgi-bin/m
>> ailman/listinfo/time-nuts
>> and follow the instructions there.
>>
>>
>
> _______________________________________________
> 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.
>
