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how to make a 405nm blu-ray laser

kdubbz

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Anyone make up a sch. for a driver for this? My blueray is on order from the GB.
 



badinstincts

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i cant find a spiffy case on wickedlasers can you point me in the right direction. maybe a link... did you mean a dragon case? will the module and 2Xcr123a fit in it?
 

badinstincts

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nice, i'm blind in one eye, lol, sorry must have missed it the first time. That is a nice case. I'll be getting it for sure, price is pretty steep though for a case. any know what range of resistors to use for 2x cr123a batts? I'm assuming we want to get the laser to 90ma which would be at around 6v right?
 

zerafiel

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Excellent guide. I actually read your guide elsewhere before too ;D

90mA sounds like you are overdriving the diode. I hear the lasing threshold can vary from 30-50mA and it is recommended to drive it at about 10-15mA above that.

So the question really is: How far can these diodes be driven typically? 90mA, 100mA, less or more?

Hmm do Dragon Cases fit CR123 batteries?? Wouldn't be too hard to turn one into a blu-ray laser if it did. Think Senkat was thinking about building a laser into that case too?
 

badinstincts

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ohh, just one more question. umm, do we really need a driver board? can we just run lasers off batteries and use a resistor to make it the right voltage for whatever power we want? wouldn't that save us a lot of battery power?
 

zerafiel

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If you actually read this thread you are posting in you'd have noticed that:

1) No driver was used in this guide.
2) 62ohm resistor was used with 6V (4x1.5V alkalines)
3) That gives him ~90mA direct(resistor) drive
4) Lower resistance gradually to test best value for 2xCR123a
 

o_DEATH_ANG3L_o

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There would be nothing wrong using DDL circuit with this. But you would have to use maybe use a 20 ohm resistor to get your 50-75 mA. I have messed with this before. I think it was 25 ohm I used and got 50 mA even so I see nothing wrong with using DDL circuit.
 

catdog

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I'm not trying to disregard the hard work done by aaron_inc, but the values given in this thread seem WAY off.  90mA seems excessively high – my bluray diode’s threshold was more like 25mA and 30mA read 8mW on the power meter (which I was comfortable with for a long lifespan).  The output power was increasing rapidly with current, so I would estimate the maximum current of my diode to be approx 35mA.

Also given that the working voltage of these diodes is 4.5-5.5V, a 62 ohm resistor with a 6V power supply will give somewhere between 8 and 24 mA - nowhere near the stated 90mA!

Again I appreciate the effort by aaron_inc, and perhaps he has a freak diode which can handle this current, but I suggest being very cautious about using 90mA as I don't want to see dozens of GB bluray diodes die because of it  :eek:
 

videomaniac

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Great guide! Could this be dropped in a Dorcy or other flashlight shown in the RED DIY Guide? Thanks!
 

zerafiel

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Now that you've gone and mentioned it, I think he just took 6v divided by 62ohm to get 90mA which really isn't the correct way to do without considering the Vf of the diode itself. I made this same mistake before so I know. But it is quite safe to make since it pushes LESS current than expected and less voltage. But if it works for him to think of it that way and he doesn't have to measure the current and his diode runs well good for him.

catdog of course you're right. I wasn't thinking straight when i really thought he actually drove all his bluray diodes past 90mA. seems unlikely unless he has a diode different from the ps3 one. A bluray burner might take that possibly. I think andy_con is working on one but I haven't checked for updates.
 

aaron_inc

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ive been through 3 diodes so far, one is completely ruined, the + wire from the battery touched the circuit board, giving the diode the batterys full current, it just made a bright flash and that was it, dead :'(.

the other one is running fine, ive got it ready to go into a sonar case, and run it off two cr123as.

the other one is running at 9v and 117ma!, its running at such a high current because i had the diode set up and running fine on the batteries but i didnt realise that the batteries were almost half dead so when i connected some new batteries, the laser was flickering alot and the next time i turned it on the dot was very dim and looked as if it had been cut in half but, after increasing the current and voltage, its running fine now :cool:.

so yeah, it really depends on the diode you get, all of the ones ive gotten run at pretty much the same current but, then again, you may get a diode that runs at a current alot lower than usual and blow it thinking that it will be like all the others.
 

aaron_inc

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thanks for all the kind words guys, if you have any questions you want to ask or photos you want me to take, just ask and ill be happy to help you ;).
 

Tallaxo

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Brilliant guide there Aaron. Thank you very much for sharing this with us.

Jase
 







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