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Old 10-02-2010, 05:54 PM #17
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Default Re: is this one 445nm diode or I received wrong diode?

As you can see it on first picture, all tests has been done using supplementary heatsink over Aixiz nut. At less than 600mA and few seconds test, heat in this case will not be a critical factor! So... I think I own "new 445 aliens" diodes!

I already informed the seller that I received wrong model. Still waiting an answer!


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Old 10-02-2010, 05:58 PM #18
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Default Re: is this one 445nm diode or I received wrong diode?

Quote:
Originally Posted by DrSid View Post
You say that you have 7.5V and 250mA on the diode at the same time !? These diodes should have about 4V at 250mA. 7.5V without current limit would kill them.

My guess would be your lab source is the culprit. Maybe it just can't give more current.
No, 7.5V is at driver input, not at diode :-)). On LM317, we have 4.3V (diode) + minim 2.2V voltage drop across driver, plus 0.5-0.7V voltage drop in wires plus dummy 1 Ohm resistor, so 7.5V is very conservative! Also, LM317 will transform surplus voltage in heat, so again, no problem if will be 8V or 9V instead... just more heat in driver! The same driver works very well with blue-ray diodes, red diodes (LPC-815) and IR diodes too ...

Last edited by alx; 10-02-2010 at 06:18 PM.
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Old 10-02-2010, 06:26 PM #19
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Default Re: is this one 445nm diode or I received wrong diode?

It looks like a SF-AW210 diode (violet; 6X; 170mA; $15). It has the short pins and the large square barcode that the SF-AW210 has.
It's even got the large "spot" under the negative pin in the barcode.



Here is the back of the 445nm diode. I know my skillz such, but you can see that the square barcode is different and smaller


Here you can see the shorter case pin compared to the anode and cathode. Straight out of the projector the anode and cathode are even longer. I cut these off just below the solder blob
Notice that there is no solder on this part of the pins


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Last edited by daguin; 10-02-2010 at 06:42 PM.
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Old 10-02-2010, 06:55 PM #20
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Default Re: is this one 445nm diode or I received wrong diode?

Quote:
Originally Posted by alx View Post
No, 7.5V is at driver input, not at diode :-)). On LM317, we have 4.3V (diode) + minim 2.2V voltage drop across driver, plus 0.5-0.7V voltage drop in wires plus dummy 1 Ohm resistor, so 7.5V is very conservative! Also, LM317 will transform surplus voltage in heat, so again, no problem if will be 8V or 9V instead... just more heat in driver! The same driver works very well with blue-ray diodes, red diodes (LPC-815) and IR diodes too ...
OIC .. all right then !
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Old 10-02-2010, 07:32 PM #21
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Default Re: is this one 445nm diode or I received wrong diode?

Quote:
Originally Posted by daguin View Post
It looks like a SF-AW210 diode (violet; 6X; 170mA; $15). It has the short pins and the large square barcode that the SF-AW210 has.
Yes indeed. I already told you in private that I know that in the past, you discovered the stamp on some 405nm blue-ray diodes! Now is clear, they shipped to me SF-AW210 instead Casio A140 diodes!

Quote:
Originally Posted by daguin View Post
Here is the back of the 445nm diode. I know my skillz such, but you can see that the square barcode is different and smaller


Here you can see the shorter case pin compared to the anode and cathode.
Again you are right! Not only the barcode, also the middle pin is shorter than other 2 pins. On my diodes all pins are the same size and all are shorter than the can!

Now, no doubt! They shipped to me 405nm diodes instead 445nm casio A140... The spot also confirm this theory: is not large flat square... is almost (flat) round ;-), like the one produced by BR diodes!

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Last edited by alx; 10-02-2010 at 07:38 PM.
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Old 10-02-2010, 08:19 PM #22
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Default Re: is this one 445nm diode or I received wrong diode?

So who did it if I may ask ?
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Old 10-02-2010, 08:27 PM #23
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Default Re: is this one 445nm diode or I received wrong diode?

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Originally Posted by DrSid View Post
So who did it if I may ask ?
Chinese peoples ... probably someone "myopic" from their depot :-)

Duh... It happens. Thanks to God we clarified it ...

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Old 10-02-2010, 08:38 PM #24
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Default Re: is this one 445nm diode or I received wrong diode?

dave said unmolested.....


i'm childish.
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Old 10-03-2010, 04:12 AM #25
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Default Re: is this one 445nm diode or I received wrong diode?

Quote:
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Oh: now i realized that scaling it (to match forum rules, no larger than 800x600), a lot of details has vanished. Dave, Patt, can you PM your private email address in order to sent photos at original resolution (4.2MB/picture). Using actual one you will not be able to zoom in and see details!
You don't need more than 800x600. Look at all that wasted space around that tiny diode in the middle of those photos. We don't need to see your bed spread in full 12MP detail! Just crop the damn photos to the object of interest: the diode.

Need free software to do it? Download Irfanview. Then just select the area that you want to crop to, go to Edit -> Crop selection, and then save it as a new file. You can even resize it after.
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Old 12-01-2010, 11:56 AM #26
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Default Re: is this one 445nm diode or I received wrong diode?

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Originally Posted by alx View Post
Chinese peoples ... probably someone "myopic" from their depot :-)
happy-end story! after almost 3 months, Chinese seller concluded that it was a mistake and sent me in compensation a lot of red diodes and few powerful br diodes (bdr-s06j).

thanks to all posters in this thread

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Old 12-01-2010, 01:21 PM #27
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Default Re: is this one 445nm diode or I received wrong diode?

Nice !
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Old 12-01-2010, 08:03 PM #28
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Default Re: is this one 445nm diode or I received wrong diode?

Glad to hear you got things worked out those china companies can be a bear to work with.
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Old 12-02-2010, 01:37 AM #29
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Default Re: is this one 445nm diode or I received wrong diode?

It seems fairly clear from the pics that these diodes are in fact 405 nm bluray ones, not casio 445 nm diodes.

Your measurements concur with this - the casio 445 nm diodes will not lase when fed with only 130 mA or so, their treshold is in the order of 200 mA. I think you have been scammed.
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Old 12-02-2010, 12:58 PM #30
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Default Re: is this one 445nm diode or I received wrong diode?

I dont understand - if you can get it to make a beam just see what color it is

there is a difference between the 405 and 445 in color that you should be able to notice
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Old 12-02-2010, 02:29 PM #31
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Default Re: is this one 445nm diode or I received wrong diode?

Yes. 405 is violet while 445 is a deep blue.
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