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Old 06-23-2011, 07:22 PM #1
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Default Diode Torture >:D

I just happened to notice that one of my 445s had a loose window, so i
figured it would be a good opportunity to decan and submerge it. The water
i used for this was nothing fancy just regular tap water. Power was
provided by my modded PSU and the diode was driven by my variable driver.
When powering 445s it can provide 50~1100mA so it was perfect. The
diode can was removed by placing it in the chuck of my hand drill and
spinning it up with a box cutter up against it (not rocket science but it
worked). Now all that was left was to hook it up and dunk it under.

Not surprisingly it worked fine, at just over 200mA the diode began to lase.
As i turned up the current however the ouput did begin to shift and warp.
Now i have watched the ouput pattern on these diodes alter as you ramp
the current up for 200mA to 1000mA, but this time it was different. The
whole ouput pattern seemed to hop and jump all over the place. My guess
it that bubbles forming on the diode were acting like little lenses and skewing
the ouput every which way as the grew and merged. In the video you can
see the resulting bubble is quite big.

The punch line is, this diode died during these *cough tests cough* but
really it was just an excuse to destroy a perfectly good diode and get some
pics and video

Make sure you heatsink your diodes, the last couple of secs of the video
show just how much heat they are capable of producing.





















this empty space should help keep the Youtube video from appearing over these photos when you enlarge them
Attached Thumbnails
Diode Torture >:D-1.jpg   Diode Torture >:D-2.jpg   Diode Torture >:D-3.jpg   Diode Torture >:D-4.jpg   Diode Torture >:D-5.jpg  

Diode Torture >:D-6.jpg   Diode Torture >:D-7.jpg  


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Old 06-23-2011, 08:04 PM #2
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Default Re: Diode Torture >:D

haha, a water heat sink lol.

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Old 06-23-2011, 09:05 PM #3
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Default Re: Diode Torture >:D

That is awesome! I was thinking that it wouldn't even fire up to lase. Thanks for the test!
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Old 06-23-2011, 09:24 PM #4
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Default Re: Diode Torture >:D

I got to say that was pretty cool!
I'm surprised that the thing lit at all, let alone lased for a period!!
Thanks for sharing....
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Old 06-23-2011, 10:03 PM #5
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Default Re: Diode Torture >:D

Ha, you can tell it didn't like that, it was hissing at the end :P
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Old 06-24-2011, 12:36 AM #6
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Default Re: Diode Torture >:D

What an incredible experiment! I have a theory about the bubbles: there is no need for insulation on the junction wire & substrate in the normally hermetically sealed unit (so none is used); the bubbles aren't boiled water at all... they form from the water splitting into H2 + O by electrolysis between cathode/anode & the diode still produces light because it still receives a good percentage of the current. If the diode became increasingly dim with each passing minute, this was probably due to the wires/substrate breaking down & making the water around the junction more conductive. If the liquid coolant was non-conductive & you hadn't nuked the diode, I bet that sucker would have gone even further! A LOT further!! How about clear mineral oil?
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Old 06-24-2011, 01:31 AM #7
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Default Re: Diode Torture >:D

Quote:
Originally Posted by AXE View Post
the bubbles aren't boiled water at all... they form from the water splitting into H2 + O by electrolysis between cathode/anode
If that were true, the effect would be roughly the same regardless of current.
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Old 06-24-2011, 01:45 AM #8
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Default Re: Diode Torture >:D

Not so Cyparagon, water dissociation increases with current not voltage. I know that from building an HHO torch for jewellery manufacture. Low voltage + high current = lots of burnable gas.
In the case of an HHO torch it's typically 30-100 amps at 2-12volts. High voltage doesn't work so well & causes the electrodes to dissolve very quickly.
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Old 06-24-2011, 01:57 AM #9
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Default Re: Diode Torture >:D

Quote:
Originally Posted by Gryphon View Post
The
diode can was removed by placing it in the chuck of my hand drill and
spinning it up with a box cutter up against it (not rocket science but it
worked).
DTR did that many months ago. Its not a new idea.
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Old 06-24-2011, 04:25 AM #10
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Default Re: Diode Torture >:D

Quote:
Originally Posted by Tech_Junkie View Post
DTR did that many months ago. Its not a new idea.
Thats where i got it from, i dont have a proper de canning tool so that technique seemed to be the next best thing

Quote:
Originally Posted by 532 with Envy View Post
I got to say that was pretty cool!
I'm surprised that the thing lit at all, let alone lased for a period!!
Thanks for sharing....
No problem, the diode was working perfectly fine for a while at just over 200mA, perfectly clean laseing output. But after so many minutes of that i decieded to crank it up full tilt to ~1100mA and see what would happen. It probably lasted no more than 8~10 secs at that current before it led'ed, after that i had fun making it hiss by repeatedly pulling it up out of the water
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Old 06-24-2011, 04:56 AM #11
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Default Re: Diode Torture >:D

Thats one pissed off diode!
Great video.
Thats always been my decanning method too except with a lathe instead of drill.
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Old 06-24-2011, 08:37 PM #12
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Default Re: Diode Torture >:D

What if you use de-ionized or pure water? Would it last longer? awesome vid!
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Old 06-24-2011, 09:44 PM #13
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Default Re: Diode Torture >:D

Quote:
Originally Posted by elnicodor View Post
What if you use de-ionized or pure water? Would it last longer? awesome vid!
IIRC pure water is supposed to be non conductive however whether that negates
electroloysis i'm not sure. I think the only way to truely get the diode to function
continously in a submerged enviroment would require the use of oil.
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