Hi Guys
I recently bought a red 300mw diode module from OdicForce
Component Bundle for 650nm (Red) 300mW+ Laser Module in Chrome Case (External Driver + Glass Lens) - OdicForce.
The module was powered of a 13.7v supply from a power supply which uses a LM317 chip to regulate voltage off a laptop power supply brick. The diode did burn things whilst drawing current from this supply
It was powered through a LM358N op-amp driver circuit which pulled about 450ma and fed around 420ma of this to the diode itself.
I had some success burning materials until this weekend, when I noticed that the diode would blink on an off (several second apart). I belive this was due to a heat issue with the tiny surface mount mofset the driver module used. My suspicions where confirmed when stability improved after the addition of a heatsink on the driver board.
However now the diode does not burn any of the items it once did. I can still focus the beam as tightly as I did before and according to current readings in line with Diode+ and Driver Out + it still draws 400+ma of current. I have also noticed that the diode produces less light "splash" than it did before. When it worked the bottom of my goggles where bathed in a red light whereas now that waste light is now dim/non-existant.
I have tested the diode using the driver provided by Odic Force and a homemade LM317 constant current circuit which delivered 500ma of current at 13.7v and around 400ma at 7.5 v(a bit high but still within the tolerances of the diode (LPC-826 658nm Red Laser Diode 250mW+ CW - OdicForce).
LM317 circuit
LM317 Current Calculator - Electric Circuit
OpAmp driver circuit
High Current LM358 Laser Diode Driver (405nm / 445nm / 635nm / 650nm / IR Diodes) - OdicForce
But neither setup lead to the desired burning.
It doesnt look like the diode has LED'ED. I have broken red diodes before and the beam they produce (even after being focused through a lens) is not as intense as my diode.But I could be wrong.
Could it be a dirty lens? My finger have pressed against the lens several times before
Here are some pictures of the beam
Here is the focused beam
https://drive.google.com/file/d/0B8p...ew?usp=sharing
Here is the unfocused beam for comparison
https://drive.google.com/file/d/0B8p...ew?usp=sharing
Help me laserpointerform your my only hope! =P
I recently bought a red 300mw diode module from OdicForce
Component Bundle for 650nm (Red) 300mW+ Laser Module in Chrome Case (External Driver + Glass Lens) - OdicForce.
The module was powered of a 13.7v supply from a power supply which uses a LM317 chip to regulate voltage off a laptop power supply brick. The diode did burn things whilst drawing current from this supply
It was powered through a LM358N op-amp driver circuit which pulled about 450ma and fed around 420ma of this to the diode itself.
I had some success burning materials until this weekend, when I noticed that the diode would blink on an off (several second apart). I belive this was due to a heat issue with the tiny surface mount mofset the driver module used. My suspicions where confirmed when stability improved after the addition of a heatsink on the driver board.
However now the diode does not burn any of the items it once did. I can still focus the beam as tightly as I did before and according to current readings in line with Diode+ and Driver Out + it still draws 400+ma of current. I have also noticed that the diode produces less light "splash" than it did before. When it worked the bottom of my goggles where bathed in a red light whereas now that waste light is now dim/non-existant.
I have tested the diode using the driver provided by Odic Force and a homemade LM317 constant current circuit which delivered 500ma of current at 13.7v and around 400ma at 7.5 v(a bit high but still within the tolerances of the diode (LPC-826 658nm Red Laser Diode 250mW+ CW - OdicForce).
LM317 circuit
LM317 Current Calculator - Electric Circuit
OpAmp driver circuit
High Current LM358 Laser Diode Driver (405nm / 445nm / 635nm / 650nm / IR Diodes) - OdicForce
But neither setup lead to the desired burning.
It doesnt look like the diode has LED'ED. I have broken red diodes before and the beam they produce (even after being focused through a lens) is not as intense as my diode.But I could be wrong.
Could it be a dirty lens? My finger have pressed against the lens several times before
Here are some pictures of the beam
Here is the focused beam
https://drive.google.com/file/d/0B8p...ew?usp=sharing
Here is the unfocused beam for comparison
https://drive.google.com/file/d/0B8p...ew?usp=sharing
Help me laserpointerform your my only hope! =P