- Joined
- May 20, 2013
- Messages
- 358
- Points
- 28
Hello! I recently disassembled my PLTB450B laser to use it on a CNC project of my course, I already got the machine up and running, but I stuggled with the laser part.
I bought this driver to use with the laser, it claims that have TTL, needed for my project.
I did the soldering of numerous diodes in series, then inserted my multimeter as an ampmeter to read the current, I adjusted to 0,7A, the voltage with nothing on the output I set to 7,5V, then I turned everything off, discharged the output capacitor then connected the LD, when I powered up, it worked as expected, even burned a dot on the cardboard bellow it.
After 2~3 seconds it went dim, like it has LEDed. :undecided: . I checked everything again and set the current to 1,2A (was the default of my later build), same thing happened, but it only stayed bright for less than 1 second.
I removed the chinese driver and connected the old LM338 driver set to 1,2A, same thing, It cames up at full brightness and then goes dim, every time I turn it on this happens.
Tried removing the DC-DC stepdown module and connecting the driver straight to the power supply and tried with another power supply, no joy. :yabbem: .
I have a little bit of hope that the LD wasn't damaged, but contesting with my test, this is a pretty little chance.
So I ask, does this kind of thing happens? I think when a LD dies its internal cavity becomes broken, so it will never be able to lase again, but when this LD flashes, the light it puts out is laser.
I bought this driver to use with the laser, it claims that have TTL, needed for my project.
I did the soldering of numerous diodes in series, then inserted my multimeter as an ampmeter to read the current, I adjusted to 0,7A, the voltage with nothing on the output I set to 7,5V, then I turned everything off, discharged the output capacitor then connected the LD, when I powered up, it worked as expected, even burned a dot on the cardboard bellow it.
After 2~3 seconds it went dim, like it has LEDed. :undecided: . I checked everything again and set the current to 1,2A (was the default of my later build), same thing happened, but it only stayed bright for less than 1 second.
I removed the chinese driver and connected the old LM338 driver set to 1,2A, same thing, It cames up at full brightness and then goes dim, every time I turn it on this happens.
Tried removing the DC-DC stepdown module and connecting the driver straight to the power supply and tried with another power supply, no joy. :yabbem: .
I have a little bit of hope that the LD wasn't damaged, but contesting with my test, this is a pretty little chance.
So I ask, does this kind of thing happens? I think when a LD dies its internal cavity becomes broken, so it will never be able to lase again, but when this LD flashes, the light it puts out is laser.