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Need a little help with diode id

J

jankro

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Mar 12, 2010
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Hello to everybody.

I have a little problem identifying a diode.
I salvaged it from an LG DVD 16X burner (GSA-4167).

Only markings on the diode are:
L96
5747

and that's it.

I built the adjustable driver (LM317) for ot and I'm getting maximum current of 276mA from it, but I have no specs for the diode.

Anybody have any ideas?

-J-
 





x90z75ek

x90z75ek

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Mar 17, 2010
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Well, I'm no expert on this but since the diode is from a 16X DVD burner it's probably a LOC or a LCC diode. The AMC driver is usually the best driver for a red laser, but u can also either use the one you used or a DDL driver. With a DDL driver you can set any current you want by putting an appropriate resistor. If the diode is a LOC or LCC it should be able to stand over 300 mA.
 
J

jankro

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Mar 12, 2010
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Solved the power supply problem, by lowering the limit resistor value to 3,6 ohms and now I can go to 400mA and higher and now it burns good. :lasergun:

-J-
 
billg519

billg519

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The LM317 driver is a good one. The resistor needed is determined by a simple formula. R = 1.25 / desired_current_in_A . So for 400mA, we would need 1.25/0.4 = 3.125 ohms. As resistors can vary, the actual output should be checked with a meter before connecting a laser diode. Do not forget to short the output cap before connecting the LD. The AMC7135 driver is a fixed output chip set at 350mA. It is also a negative side regulator, so is best used in a positive ground host for an IR laser build. I have used 8 x 7135 to provide 2800mA to an IR c-mount. Works great for these. A red LOC or LCC diode is a negative groumd device, so a positive side regulator like the LM317 or the 1117 is a good choice.
 
x90z75ek

x90z75ek

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billg519 said:
The LM317 driver is a good one. The resistor needed is determined by a simple formula. R = 1.25 / desired_current_in_A . So for 400mA, we would need 1.25/0.4 = 3.125 ohms. As resistors can vary, the actual output should be checked with a meter before connecting a laser diode. Do not forget to short the output cap before connecting the LD. The AMC7135 driver is a fixed output chip set at 350mA. It is also a negative side regulator, so is best used in a positive ground host for an IR laser build. I have used 8 x 7135 to provide 2800mA to an IR c-mount. Works great for these. A red LOC or LCC diode is a negative groumd device, so a positive side regulator like the LM317 or the 1117 is a good choice.
Click to expand...

So the AMC7135 is the best choice for an IR laser. Didn't know that. So you used 8 x 7135 for an IR c-mount, what about an IR laser with a 9mm diode? Would the same driver be the best choice for that too?
 
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