Old 02-08-2017, 01:43 AM #1
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Unhappy Can anyone find info on these diodes?

I just bought these 112287670557 on eBay and it's a good deal it would be around 1.50 for each diode so couldn't pass it up they are ir I think but the question is what kind of diode could these be? If anyone has ever seen any like these please tell me what they are and if you can find any data sheets that would be much appreciated!


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Old 02-08-2017, 01:59 AM #2
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Default Re: Can anyone find info on these diodes?

Got a direct link? The item number isn't working for me.
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Old 02-08-2017, 02:01 AM #3
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Default Re: Can anyone find info on these diodes?

Unknown laser diode lot | eBay that should work I think I already bought them so I don't know if the number works or not.
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Old 02-08-2017, 02:08 AM #4
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Default Re: Can anyone find info on these diodes?

IR diodes, by the sellers vague description maybe 1W or so, unknown wavelength but IR for sure.

You'd have to hook one up and test it (spectro, LPM required) to be at all sure.
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Old 02-08-2017, 02:12 AM #5
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Default Re: Can anyone find info on these diodes?

Do you think it might have been a good buy though? I mean there are 30 of them all for 45 dollars.
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Old 02-08-2017, 02:14 AM #6
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Default Re: Can anyone find info on these diodes?

Quote:
Originally Posted by Branson33 View Post
Do you think it might have been a good buy though? I mean there are 30 of them all for 45 dollars.
30 IR diodes for $50 ain't too bad. They could be 808nm, 980nm etc... you'd have to test them as diachi said!

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Old 02-08-2017, 02:21 AM #7
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Default Re: Can anyone find info on these diodes?

Alright thank you guys! Makes me feel better but if anyone knows like what brand or style these diodes are that would be awesome or some data sheets because I've never seen them in this shape before.
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Old 02-08-2017, 03:38 AM #8
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Question Re: Can anyone find info on these diodes?

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Unknown laser diode lot | eBay that should work I think I already bought them so I don't know if the number works or not.
finally saw the listing now...

I'm going to guess that these might be an A package type LD? The picture isn't all that clear to me. ---> They're usually 808nm

I'm going to go with Diachi's opinion here too.
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Old 02-08-2017, 04:30 AM #9
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Default Re: Can anyone find info on these diodes?

I think it's probably 808nm. I haven't seen too many 980nm diodes on eBay for that cheap.
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Old 02-08-2017, 02:43 PM #10
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Default Re: Can anyone find info on these diodes?

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I think it's probably 808nm. I haven't seen too many 980nm diodes on eBay for that cheap.
Actually, based on the sellers description it's possibly higher than 808nm.

Quote:
I did not see a red, blue or other color dot


Usually you'd see a little tiny bit of red with 808nm.

I agree, 808nm diodes are normally cheaper than 980nm diodes. But the seller doesn't know what he has so that doesn't really apply...
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Old 02-08-2017, 04:09 PM #11
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Default Re: Can anyone find info on these diodes?

Yes, in order to sell for the right price, you kind of have to know what you are selling. If there is no visible dot at all, then it is most likely to be 980nm. Like Diachi said, 808nm can be seen still.
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Old 02-09-2017, 12:17 AM #12
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Default Re: Can anyone find info on these diodes?

Thanks for all the feedback guys, but if I would just straight up hook one of these up to a variable power supply and put it at the right voltage and current would it hurt them? If so how would I go about building a driver for one of these?
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Old 02-09-2017, 12:24 AM #13
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Default Re: Can anyone find info on these diodes?

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Thanks for all the feedback guys, but if I would just straight up hook one of these up to a variable power supply and put it at the right voltage and current would it hurt them? If so how would I go about building a driver for one of these?
If you know the right current and have adequate cooling, then no, it wouldn't hurt.

What the right current actually is seems to be anyones guess, unless someone manages to locate a datasheet somehow... Would just need to test, possibly killing/damaging a couple to figure out roughly where it should be set.

Figuring out the exact wavelength would help pinpoint the correct drive current/voltage as diodes at specific wavelength ranges generally have similar voltages when running at spec.

An LM317 or LM338 (5A limit instead of 1.5A) constant current circuit could likely drive one of these fine.
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Old 02-09-2017, 12:27 AM #14
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Default Re: Can anyone find info on these diodes?

Well the guy hooked it up to a curve tracer and it turned on at 2.2 volts and said it could handle an amp in pulses I guess or just an amp without pulses with the right heatsink but how can I measure wavelength is there anyone I could send one to to test it out?
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Old 02-09-2017, 12:36 AM #15
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Default Re: Can anyone find info on these diodes?

Quote:
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Well the guy hooked it up to a curve tracer and it turned on at 2.2 volts and said it could handle an amp in pulses I guess or just an amp without pulses with the right heatsink but how can I measure wavelength is there anyone I could send one to to test it out?
There's a few members on here with spectrometers that could potentially test the wavelength for you - maybe one will chime in. The other option is talking to a local university, many science departments will have that sort of hardware.
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Old 02-09-2017, 12:45 AM #16
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Default Re: Can anyone find info on these diodes?

Thank you diachi your the best but anyway could you maybe find me something on eBay that could potentially drive this laser? It turns on at 2 -2.2 volts I think and can handle an amp or possibly more I'll try to test one with just the power supply to see how many amps it can take first though.
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