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Old 09-06-2011, 05:30 AM #1
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Default Diode/Laser Checks

Now I am new to lasers and this thread so don't judge me too harshly.
I am not quite sure if this is the thread I need to be posting in for this but it seemed to fit.

I have taken some diodes out of a few dvd burners and have tried to test them.
I have had my learning experiences and what not.


I am currently using this right now with 2 mini-alligator clamps on the leads.

Its a 3v encasement that holds 2 AA battery.

Now what I am basically asking is what is your main object and or method for checking a diode once you have extracted it without frying it

AND - is 3v a safe and correct strength to use with diodes? too much / little?

Any feedback to <-- noob will be much appreciated.


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Old 09-06-2011, 05:33 AM #2
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Default Re: Diode/Laser Checks

What are you checking for exactly? Also, what DVD drive did this diode come out of?
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Old 09-06-2011, 05:38 AM #3
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Default Re: Diode/Laser Checks

In my opinion,a diode cannot be checked. It can only be turned on. The only way you can guarantee a successful laser build is with careful precaution, safe handling, ESD protection and some skill in soldering.

For RED diodes, 3V is an appropriate voltage to run these diodes at. Blu-Ray diodes and 445 diodes typically run at around 4.5V and sometimes higher depending on how you work with them.

Furthermore, I don't see the word CURRENT REGULATOR or DRIVER in your post. Please use one. Solder input leads into them, use a test load to set everything up before you attach the diode, and then once you have your current set, solder in your diode. The only time when you can hook up a diode with clips as such is when you have a bench power supply that can spit out a really regulated current and voltage

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Old 09-06-2011, 05:44 AM #4
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Default Re: Diode/Laser Checks

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Originally Posted by ARGLaser View Post
What are you checking for exactly? Also, what DVD drive did this diode come out of?
Checking: Saying hypothetically I got it out of a drive I wasn't sure it the diode had still worked. (Someone gives you a comp, you have no idea what works and what doesn't ya know.)

And I pulled it out of usually a x12 dvd burner. Brand varies.
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Old 09-07-2011, 02:49 PM #5
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Default Re: Diode/Laser Checks

batteries are more stable than a lot of AC-DC converters, and cheap to boot! You'll want to make sure the voltage isn't too high for whatever type of diode you're checking, and use cheap batteries, because they generally will have a higher internal resistance that will help limit the current to your diode.

I'd also suggest putting a switch inline with one of the leads. Diodes don't care about being modulated, but it's easier to attach leads without worrying about being blinded.
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