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Old 01-21-2017, 12:23 AM #49
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Default Re: The Little Diode That Could

That's amazing, can't believe that little diode is still up and running after all this time. That is diffidently, " the little diode that could " '!!


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Old 01-21-2017, 12:56 AM #50
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Default Re: The Little Diode That Could

It could actually hold a record for the longest continously powered laser diode by now - not sure if there is any previously documented record for this.

This might also give you a bit of a problem in the future if you want to keep it up. The longest working incandescent lighbulbs known at the moment have been lit for a century or so.

There is no intrinsic mechansim this laser diode -must- fail at some point, it might outlive you, and even your grandchildren.

I guess with laser diodes and led's we get a new perspective on how long something can emit light - perhaps some equipment installed already will make a 1000 years if preserved.
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Old 01-21-2017, 01:05 PM #51
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Default Re: The Little Diode That Could

I remember when you started this and completely forgot about it.
I think it's just going to keep on running until you give up and turn it off.
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Old 01-21-2017, 02:46 PM #52
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Default Re: The Little Diode That Could

Benm, I hope it makes some kind of record but as of now I can only claim second longest continuously run diode. Styropyro has a thread with a much nicer diode that lasted 54,000 hours. It was just shy of 6 years. But since his experiment has come to a close, maybe this could hold the record for longest surviving continuously run laser diode? The biggest difference here (the one that still surprises me) is that this fasttech diode uses only a resistor as its "driver" and cost me about $0.25. It would be neat to see if there is any other experiment that's been run. I did preliminary Google searches but I could find anything at all. Surely the laser manufacturers are doing tests like this... right?

Antharak, I read your post aloud and my wife said "Well, it's been this long, we can't give up on it now." Haha, the whole Javalin gang is in on this one. In fact I read Benm's post too and my son said "It's okay dad, when you die I'll make sure it keeps going!" I think we're in this for the long haul. I haven't been around in the forums as much, but I'm trying to remember to post every 6 - 12 months on this little diode.

I've since acquired a UPS to transfer the wall adapter to. I live in tornado alley now and thunderstorms are a serious threat to the power. I haven't lost power but some people are calling for a particularly active tornado season this year. So here soon I'll be making the switch. The UPS battery ought to be enough to power the diode for weeks.
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Old 01-22-2017, 12:41 AM #53
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Default Re: The Little Diode That Could

Manufacturers generally don't do tests like those, they use accelerated ageing putting the diode in elevated temperature, temperature and humidigy swings and things like that to simulate what would happen over a longer period. That way they can give some spec on expected lifetime without actually waiting that long. This is fairly imporant if you want to sell something with a 5 year warrantee but want to bring it to market a lot faster than that.

As far as how long these things can potentially run: There is a clock powered by atmospheric pressure change that has been running since the 1860s. It's never been rewound, but has been stopped for cleaning since that time.

I'm not aware of any lasers or even leds that have been running for record times, but i reckon there might be some out there. I can imagine there are leds sitting in control panels that have been lit continously from the 70s, as well as laser diodes that must have been running all the way from the 80s. Finding and documenting them is another thing though...
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Old 01-22-2017, 12:52 AM #54
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Default Re: The Little Diode That Could

I'm guessing 65 thousand hours. Then lights out. Could go for 400 thousand or more though.
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