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Gadget Freak

Gadget Freak Case #233: Inline Clock With Incandescent Display

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tvshores
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Iron
This link provides supplemental information
tvshores   2/22/2013 1:31:21 PM
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Be sure to scroll down to the last entry.

 

http://www.decadecounter.com/vta/tubepage.php?item=10&user=0

 

 

radio-active
User Rank
Iron
Very cool!
radio-active   2/22/2013 2:06:52 PM
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I love the use of the clunking relay as a chime.

mrdon
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Platinum
Re: This link provides supplemental information
mrdon   2/22/2013 4:37:47 PM
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tvshores, Oops, thanks for directing me to the link at the bottom of the entry page!

mrdon
User Rank
Platinum
Re: Source of displays
mrdon   2/22/2013 4:39:59 PM
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D.Sherman, Do you think an appropriate size single digit 7 Segment LED Display will have the same visual appeal as the inline incandescent device?

D. Sherman
User Rank
Gold
Re: Source of displays
D. Sherman   2/22/2013 5:06:30 PM
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mrdon,

I don't think an segmented display will look like a projector display because they are completely different schemes. The projector device is actually an array of miniature slide projectors, each with its own lamp, "film", and lens, but all projecting onto the back side of one screen. The "film" can be any image at all, which means that in the case of numbers, they can be formed complete in any font that one wants, rather than being approximated by means of segments. Of course one could use the appropriate images in a projector display to simulated a segmented display, but where's the fun in that?

GeoOT
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Gold
Rear projection numeric displays
GeoOT   2/22/2013 7:53:59 PM
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I remember these displays quite well.  They were used on a specialized Xerox copier that I helped buld in the 60s called "System 3-2-1".  They were made by IEE,  Industrial Electronic Engineers of North Hollywood, CA.  The company is still in business.  See: http://www.ieeinc.com/about-us   Also, there is a very nice descriptive page about the displays including a disassembled view at:  http://www.decadecounter.com/vta/articleview.php?item=511

They were great.  Much easier to deal with than Nixie Tubes.  No special power supply needed. 

dpccreating
User Rank
Iron
Re: Repurpose
dpccreating   2/23/2013 1:45:41 PM
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I think the bulb life is a function of the bulb, and how bright (applied voltage) you run it.  This clock has been running for a year with no issues so far.  Last time I checked they were still availble for this display anyway, its a common indicator bulb.  Some of the types have a 300,000 hour MTBF so I think I'm good with it for my clock.

dpccreating
User Rank
Iron
Re: Repurpose
dpccreating   2/23/2013 1:52:10 PM
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I've been dragging these around in my junk bin for 30 years, since I was a student.  When I was a student tech in a physics lab, we would scavenge old equipment for parts.  These were deamed obsolete at the time, but too cool for the trash bin!

Unfortunately I didn't keep the big ones.


Search Ebay for "one plane readout", they are listed sometimes.

D. Sherman
User Rank
Gold
displays available
D. Sherman   2/25/2013 9:04:12 PM
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I have a bunch of them, new old stock military surplus. $10 apiece if you just want a few for your own use and won't try to resell them for a profit. Will put them on ebay at some point for more money, but thought I'd give the guys here first crack at them. Films have various cryptic military-related legends on them so you'll need to make your own with numbers. Note that color is a definite option with these if you can make a color transparency or use colored LEDs instead of incandescent bulbs (not included, T1-3/4 size)

vandamme
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Gold
Generator
vandamme   2/27/2013 4:13:03 PM
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I also noticed the hand-crank telephone generator in the background. I had one of those too, and some of the projection readouts. Sometimes, you have to cull, though...

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