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Freak 803T Diode **A New Mystery**

Zom-B

Zom-B

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Re: Freak 803T Diode **Mystery Solved**

Indeed, it shouldn't be possible for a normal diode.

I also have one of these diodes that keeps just going on, but I didn't dare increasing any more. It's not the most efficient diode, but the one with the highest knee.

It's the yellow curve in this graph.
PHR-803T.gif


I've ran it at 198mA for a few minutes total and it's been running it at 150mA / 140mW for two weeks now (casual use) and it's still going strong (my 9V NiMh does not supply enough voltage for the LM317 driver to reach the 198mA)
 





daguin

daguin

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Re: Freak 803T Diode **Mystery Solved**

Zom-B said:
Indeed, it shouldn't be possible for a normal diode.

I also have one of these diodes that keeps just going on, but I didn't dare increasing any more. It's not the most efficient diode, but the one with the highest knee.

It's the yellow curve in this graph.
PHR-803T.gif


I've ran it at 198mA for a few minutes total and it's been running it at 150mA / 140mW for two weeks now (casual use) and it's still going strong (my 9V NiMh does not supply enough voltage for the LM317 driver to reach the 198mA)
Click to expand...


My "personal" blu-ray has been running at 190mA (180mW after Merideth glass) for over a month (almost daily use - 1 minute duty cycle) :)

I was GOING TO run my next experiment at 200mA. I guess I just jumped the experiment up 100mA more than I had intended with this mistake ;)

Peace,
dave
 
IgorT

IgorT

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Re: Freak 803T Diode **Mystery Solved**

daguin said:
I was GOING TO run my next experiment at 200mA.  I guess I just jumped the experiment up 100mA more than I had intended with this mistake ;)
Click to expand...

Haha, you're crazy man! I don't know what voodo you use, to make the poor abused diodes last.. Unless it's really about the lower efficiency.

But as you observed yourself, your latest victim obviously degraded A LOT, right in front of your eyes..


Too bad you don't know the voltage on this super-freak, so i have to guess, but the efficiency dropped to around 10.5%...
The efficiency of my latest personal blu ray diode is 18.5% at room temp, which is slightly above average.

So i'm afraid it'll just pop at a power up.. :(


I would really like to know what it would do at a more normal current (and when i say "normal current" i'm not talking about 180mA, Dave ;))... But at this point, i would not be surprised, if it would keep lasting at this current for a while, but would die instantly after setting it to 125mA..  ;D

Either that, or it would do 50mW.. :(
 
daguin

daguin

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Re: Freak 803T Diode **Mystery Solved**

IgorT said:
Haha, you're crazy man! I don't know what voodo you use, to make the poor abused diodes last..
Click to expand...

I've found that it seems to help if I hold my tongue in the right corner of my lips and "wince" slightly when I push the button. :D :p ;)

Peace,
dave
 
IgorT

IgorT

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Re: Freak 803T Diode **Mystery Solved**

daguin said:
I've found that it seems to help if I hold my tongue in the right corner of my lips and "wince" slightly when I push the button.   :D :p ;)
Click to expand...

I knew there must be something! ;)


Do you include this in the instructions for your lasers? ;D
 
daguin

daguin

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Re: Freak 803T Diode **Mystery Solved**

IgorT said:
[quote author=daguin link=1216544221/0#19 date=1216581130]I've found that it seems to help if I hold my tongue in the right corner of my lips and "wince" slightly when I push the button. :D :p ;)

I knew there must be something! ;)
Do you include this in the instructions for your lasers? ;D
Click to expand...

I used to, but I discovered that not everyone is right-tongued. The left-tongued among us have been known to explode if they hold their tongue on the right side of their mouths while concentrating.


Don't ask . . . .It wasn't pretty :-[

Peace,
dave
 
N

nikokapo

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Re: Freak 803T Diode **Mystery Solved**

wait, what? it hasnt died yet?

Immortal Diode.


isnt a 6x the same as the 803t?
 
daguin

daguin

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Re: Freak 803T Diode **Mystery Solved**

nikokapo said:
wait, what? it hasnt died yet?
Immortal Diode.
isnt a 6x the same as the 803t?
Click to expand...

I put it away until I can get a good heat sink for it. I want it to live as long as it can. I want it to see the sky at least once before it dies

I'm such a romantic ;)

I do not have a 6X in a form that I can do a comparison of them

And, NO. I'm not disassembling my 6X just to play with it's characteristics. The graphs of the two diodes appear to be different, but not much at powers below 170mW. There's not enough of the 803T's around running at or above 170mW to know. I'll keep making them and playing with them though. Very few people have seen what 180mW of blu-ray look like in the night sky ;)

I'm such a giver . . . .Is that part of being a romantic?

Peace,
dave
 
GooeyGus

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Re: Freak 803T Diode **Mystery Solved**

super freak -- super freak -- she's super freakaaaaaay

Oh, and at the higher currents the 6x's are way more efficient than the 803's... my 6x was doing over 200mW after optics at only 185mA. Another thing is that the 6x doesn't have the 'flat' looking beam likt the 803 diodes, it's a bit more 'filled out'
 
IgorT

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Re: Freak 803T Diode **Mystery Solved**

And the forward voltage of a 6x is around 1V lower... Voltage also matters in efficiency. So even if the 6x takes more current for the same power, it's efficiency could be the same or even better, than that of a PHR.

Did someone ever calculate the efficiency?
 
Zom-B

Zom-B

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Re: Freak 803T Diode **Mystery Solved**

Hmm, efficiency involves volt too :-/ nice mistake for someone who studied electronics. I'll take back what I said about the knee being at the point of highest efficiency. Now I realize it is at the point of highest mW/mA ratio.
 
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nikokapo

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Re: Freak 803T Diode **Mystery Solved**

IgorT said:
And the forward voltage of a 6x is around 1V lower... Voltage also matters in efficiency. So even if the 6x takes more current for the same power, it's efficiency could be the same or even better, than that of a PHR.

Did someone ever calculate the efficiency?
Click to expand...

Oh, great.

and the flat beam is not very good, i dont really like it. let's give the manufacturers some time to make the diodes even better :)
 
FireMyLaser

FireMyLaser

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Re: Freak 803T Diode **Mystery Solved**

My beam isn't flat, it looks like the ps3 (oval-ish).

Is that normal? :-?
 
IgorT

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Re: Freak 803T Diode **Mystery Solved**

They vary a little.. I've tested 29 diodes so far, and some are flatter, and the others are more oval.

But all of them are pretty flat. The difference is in HOW flat.. ;)
 
daguin

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Re: Freak 803T Diode **Mystery Solved**

FireMyLaser said:
My beam isn't flat, it looks like the ps3 (oval-ish).

Is that normal? :-?
Click to expand...

The flat beam is normal. It is an artifact of the shape of the crystal. Just focus it. You will not be able to see it when you are focused to a tight point (and it will burn like the dickens).

Quite honestly, I don't care how the beam looks when it is not focused. That's not where I use it. ;)

Peace,
dave
 
IgorT

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Re: Freak 803T Diode **Mystery Solved**

Dave...

Is your meter showing the same powers as Glenn's meter? I think he said something about you comparing the two....
 
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