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Drivers.

Ilotrophic

Ilotrophic

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11711-diy-homemade-laser-diode-driver-lm317_components01_001.jpg

Does this prove to be a sufficient driver for the 150mA requirements for the diode?

And is it possible to make a driver without using the LM317?
 
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Blord

Blord

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You need a fix 8.3Ohm resistor for 150mA output. No problem with the LM317.

There are other options for drivers than LM317. You can use LM1117, AMC7135, Flexdrive, Kikoukan driver, Dealextreme drivers, etc.
 
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jimdt7

jimdt7

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As blord said you have to change the resistor value to 8.3ohms.
Make your driver on a breadboard and test it with a test load.
All the information you need to make both is here: Laser Driver
 
Ilotrophic

Ilotrophic

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Meatball said:
Yes. But there could be disadvantages. It will depend on what your needs are.

Sooo.. what do you need?
Click to expand...

Basically a driver for a 30mW 532 laser. Finding an already made driver for that is seemingly impossible. I am trying to avoid buying a cheap 30mW module and grabbing the driver out of it.
I was wanting to make it (not anything outstanding) it's wasn't gonna be for hardcore use.
And I have a nice set of resistors, capacitors, diodes ect just from collecting but I don't have that blasted LM317. I live in a rural POS town with no stores to pick one up. (Bummer)


And BTW thank you all for your informative answers.
 
Meatball

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If you have some op amps or transistors, you'll be on your way in no time. Just using a transistor as a simple current source can be enough for the job.

Otherwise, any IR/Red laser diode driver should work. A 30mW green module will be pumped with about 200mws of IR, so a Red/IR driver set to 250mA should be all you need. But hey, ordering an LM317 is just as easy.
 
Ilotrophic

Ilotrophic

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Meatball said:
If you have some op amps or transistors, you'll be on your way in no time. Just using a transistor as a simple current source can be enough for the job.

Otherwise, any IR/Red laser diode driver should work. A 30mW green module will be pumped with about 200mws of IR, so a Red/IR driver set to 250mA should be all you need. But hey, ordering an LM317 is just as easy.
Click to expand...

Awesome! That is definitely a piece of information that will help me a lot. In more area's than 1.
 
Ilotrophic

Ilotrophic

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Meatball said:
If you have some op amps or transistors, you'll be on your way in no time. Just using a transistor as a simple current source can be enough for the job.

Otherwise, any IR/Red laser diode driver should work. A 30mW green module will be pumped with about 200mws of IR, so a Red/IR driver set to 250mA should be all you need. But hey, ordering an LM317 is just as easy.
Click to expand...

So this will suffice as a driver for that unit then?

LM317%20components01.jpg


If so I'll make a note of it to pick up a LM317 next time I have to run into the city. :beer:
 
Meatball

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Yep, that's the standard current driver using the LM317. You can probably order samples from NI, NS, or TI, if you want some free chips sent to your place.
 
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