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Old 02-10-2011, 03:07 PM #1
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Arrow I have a 16x diode need advise

Hi, I am new to building lasers. I have been reading as much as I can, and trying get as much info as I can so I dont have to ask questions that are repetitive. But I need to ask, as I dont want to do this build wrong, and I wan the most power and efficiency that I can get from my laser diode. I have a host brinkman aluminum flashlight that I had laying around, LG 16x diode, I ordered an axiz housing, I have pc heatsink that I am modifying to fit the host with axiz housing, then I have several lith-ion batty's to get the 7.2-7.4 and up range ( 2x 14500's make 7.4, 15270's make 7.4 and more.) I make e-cig mods. So, I am working on the driver. I just want to build my own, but able to fit in my host so needs to be small and simple. I saw this:

can I use this setup? what would you change in this setup to get most power this diode can handle? I am doing it on the cheap as I have only spent $4 on the axiz housing, saving for my next laser build.

Thanks in advance. Like I said i don want to be repetitive, but I have been reading this site for a while and there is so much helpful info. After this build its on to a 1w blue. ( I know all safety precautions )


side note: I am having a hard time finding a 5ohm resistor at my local radio shack.......if above setup will work for me, is there an alternative to the 5ohm resistor???



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Old 02-11-2011, 12:56 AM #2
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Default Re: I have a 16x diode need advise

I am pretty confused with the math needed and so on. I really dont want to buy a driver for this one. I couldnt find a 100ohm pot meter at my local stores. I dont want to order anything online either cause that would be like just ordering a driver. I have read alot and I admit I am confused. The diagram shown above seems the best and easiest way to go for me, I just need to know if it will give me the max power output I can use safely. Thanks, cause I am going nuts with this. I want to do it right and easy. I want to prepare for my next build.
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Old 02-11-2011, 01:20 AM #3
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Default Re: I have a 16x diode need advise

5 ohms will give you a 250ma output current.
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Old 02-11-2011, 01:41 AM #4
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Default Re: I have a 16x diode need advise

Thank you very much. is 250ma safe for me? what mW will it give it? sorry for my ignorance, I am a slow learner.
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Old 02-11-2011, 02:40 AM #5
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Default Re: I have a 16x diode need advise

I'm not sure of the output of the 16x, and 250ma should be fine even 300ma would probably be ok. You should be able to get 150mW - 200mW out of a 16x.
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Old 02-11-2011, 03:36 AM #6
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Default Re: I have a 16x diode need advise

will I achieve that power with this setup? I know I have to change the resistor up a little to make the power higher???
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Old 02-11-2011, 03:50 AM #7
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Default Re: I have a 16x diode need advise

4.2 ohms will give 298ma.
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Old 02-11-2011, 03:58 AM #8
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Default Re: I have a 16x diode need advise

Check Mouser.com or Digikey.com for electronic parts. Shipping doesn't show when you order, but they do give you a shipping estimate(usually around $5 for UPS ground on small orders).

Go here to calculate you resistor value: >>link<<

And plug in the value and wattage greater than indicated by the calculator here: >>link<<
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Old 02-11-2011, 04:00 AM #9
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Default Re: I have a 16x diode need advise

Hey Drew, as far as the math goes, on that LM317 chip it produces a 1.25V difference between the output and the ADJ pin. From there you can calculate how much current would be produced by putting a resistor between those two pins using Ohm's law: Voltage = Current * Resistance
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Old 02-11-2011, 04:52 AM #10
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Default Re: I have a 16x diode need advise

Thank you all for the very helpful info and sharing your knowledge. Now I ask how do I get a 4.2 ohm ( 1/2 watt?) radioshack dont carry one??? I dont want to order online, like I said I want a homebuild. If I order online I might as well just order a pre built driver cost wise. so what do I do to get that 4.2 ohm resistor???? Thank you all again!!!!
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Old 02-11-2011, 05:02 AM #11
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Default Re: I have a 16x diode need advise

Are you near a Fry's Electronics?
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Old 02-11-2011, 05:08 AM #12
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Default Re: I have a 16x diode need advise

no, no frys near me.
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Old 02-11-2011, 01:41 PM #13
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Default Re: I have a 16x diode need advise

I think a 16x has the possibility to even turn into a class IV..
get yourself 4x 1r 1/2w resistors.. wire them series and solder on the lm317..
blurays need a higher voltage.. so you will be fine with anything over 8.5v. Just heatsink the lm317 a little (I forgot that, after testing my driver I put my fingers on the lm.. now I got "LM317" written on my flesh )...
if you are going to use less resistors less resistance, stick to a higher wattage resistor, else it'll burn. brightly!
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Old 02-11-2011, 01:46 PM #14
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Default Re: I have a 16x diode need advise

thanks for the info. whats a 1r resistor? was that a typo?
also what will that give me? mW? ma? thanks again
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Old 02-11-2011, 01:49 PM #15
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Default Re: I have a 16x diode need advise

nope. I don't really know if you people use that designation, it is more common to we (in Brazil) to write/say 1r resistor instead of 1ohm or 1Ω
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Old 02-11-2011, 01:54 PM #16
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Default Re: I have a 16x diode need advise

will that drop my power down? I am a little confused?
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