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Freak LPC-815 laser

robjdixon

robjdixon

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I was playing around in the garage earlier, building lasers primarily to sell so I can afford a PSU for my argon, and I made a red LOC laser with a rkcstr driver. Little did I know the Rkcstr was faulty, and it actually put out 600mA. I'm not sure if the driver is completely broken, but if I use 1 CR2 instead of two, the current drops to 150mA.

It has been going for over an hour now, and with a Virtual village glass lens, puts out 340mW. I'll keep you updated on its progress.

Pics possibly soon
 





I once happened to run my LPC at >600mA as well for a while; somehow the pot on the FlexDrive got moved. I noticed the unusual brilliance and that it got rather hot within seconds (I have no extra heatsink, just the Aixiz). I've been running it like that for maybe a few minutes before disassembling it and resetting the current to 420mA. It's quite possible that the LPC can stand currents a lot higher than we think.
 
I'll keep you updated. I measured the power before the current, and I thought it was at 420mA, and when it hit 330mW, I was like WTF!?
 
I have one of these freak diodes too. When I made the laser in the attached photo, I was having a bad day. First, when machining the host, I forgot to allow room for a driver. When I got home to do the electronics and assembly, I soon discovered my error. So, I had to assemble the driver right on the legs of the diode from surface mount components. There was now enough room. Only trouble is, I reached into the wrong drawers for components. Somehow I used the wrong IC and the wrong resistors to make my driver, and I didn't even notice. Finally, the laser was assembled, so I inserted 2 x CR2 lithium 3.7V and pressed the tailcap button. Only then did I have an inkling that there was something out of the ordinary. This laser was extremely bright! Well, it should be bright, it's giving off 510mW ...

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Its still going guys. I might try to sell it (with a warranty) if anyone is interested, as I need argon money
 
I've had one of these as well, using a hand built LM317 i ran it at 554mA without knowing it, and it survived for 6 months. pretty neat little diode. Maybe we all are being too cautios with out diodes these days, with a grain of salt of course ;)

I've got a spare. I'm gunna run it at 600mA in a press fit copper heatsink with meredith lens and see what i get!!!

Tyler - Dark Lasers
 
aww, man!
I had an issue with my driver. It was putting out 380mA, and all was well, but then it jumped up to >600mA. My lpc lasted a quarter of a second before it blew :/
 
Yeah I had a 22x diode from daedallasers.com and my driver was messed up and it was made wrong so it was still giving all the current of my 2 AA's so when I hooked up the power and turned it on and where it shined on my hand (w/out lens) it got really warm
The diode died in about 2 seconds
 
robjdixon said:
Its still going guys. I might try to sell it (with a warranty) if anyone is interested, as I need argon money
Click to expand...

Do you remember where you got the diode from? Maybe it's not a regular LOC, have you checked for marks on it?

The red laser market on LPF is going downhill... It'd be nice if a seller would start cherry picking these monsters :)
 
Sure you can run these diodes at high currents, but there comes a point when the extra current doesn't up the output much more, and it just gets turned into heat. Surely you have seen drlava's diode comparison graphs? At the top you can see the diodes efficiency decreasing with higher currents ...
 
billg519 said:
I have one of these freak diodes too. When I made the laser in the attached photo, I was having a bad day. First, when machining the host, I forgot to allow room for a driver. When I got home to do the electronics and assembly, I soon discovered my error. So, I had to assemble the driver right on the legs of the diode from surface mount components. There was now enough room. Only trouble is, I reached into the wrong drawers for components. Somehow I used the wrong IC and the wrong resistors to make my driver, and I didn't even notice. Finally, the laser was assembled, so I inserted 2 x CR2 lithium 3.7V and pressed the tailcap button. Only then did I have an inkling that there was something out of the ordinary. This laser was extremely bright! Well, it should be bright, it's giving off 510mW ...
Click to expand...

Do you know what the current/voltage was across the diode? I'm surprised it didn't blow immediately, since at that power its over 400% the manufacturer specified output.
 
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