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Old 02-10-2011, 02:06 AM #17
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Default Re: Single 10440 build

@off topic
It may be a silly question people, if I put a 1ohm res in a LM317 driver config, @ 12v lead acid car battery, will it power a 445 diode properly (with filtering and such.. as seen on DDL driver) ? It should output 1250mA there.
Thanks for any answers.


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Old 02-10-2011, 02:26 AM #18
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Default Re: Single 10440 build

Quote:
It should output 1250mA there.
1250mA is your input, your output will likely be something 1000~1300mW.
Yeah, that should work just fine, as long as you heatsink properly.
The lm317 gets very hot at this current and voltage.
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Old 02-10-2011, 02:28 AM #19
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Default Re: Single 10440 build

I said 1ohm res..
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Old 02-10-2011, 02:37 AM #20
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Default Re: single AAA or single 10440?

Quote:
Originally Posted by Leodahsan View Post
Hey Larry. Direct drive would fry a LOC or LPC diode, right? I'm not going to build a low powered 445 here.. I have better plans to A140..
You can drive a LOC with a 10440 and the proper resistor.

It is something you must test first.

I would start around 2.2 ohms for the resistor (1/2 watt).

The LOC must be in a decent heatsink.

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Old 02-10-2011, 02:40 AM #21
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Default Re: Single 10440 build

@Larry
Mike posted a pic. It is like 30mm long OD 25mm. I think it could suffice, as short runtimes are wanted in such a small battery. You say, only a resistor? I have saved a lot space for the driver (it fits like 6 flex here..). Nah nevermind. Just a question, I'm sleepy and I don't know ohms law a lot.. 2.2r would be how much output in a LOC? 2r would suffice? Remember, short runtimes will be observed..

Thanks Larry.
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Old 02-10-2011, 03:02 AM #22
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Default Re: Single 10440 build

Direct drive is your only single cell solution. A 9ohm resistor will limit the current to 433mA which is perfect for LOC/LCC. 4.2V fully charged cell == 3.9V under load ... 3.9V/9Ω = 0.433A, 10ohm would be 0.39A and so on. A LM1117 might work, but it needs 0.9V of overhead so your usable voltage is only 3V.
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Old 02-10-2011, 03:06 AM #23
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Default Re: Single 10440 build

^lol at larry "2.2r" res. Who is right, then?
Thanks anyways. I'll start with jib values. Dissipation?

0.433 x 3.9v? 1.56W ?
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Old 02-10-2011, 03:07 AM #24
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Default Re: single AAA or single 10440?

Quote:
Originally Posted by Leodahsan View Post
actual progress (sorry for pic size)

http://i54.tinypic.com/161fbjr.jpg

would make easier for everyone to understand. I need the heatsink for this little build, as everyone can see I'm holding the aixiz 'head' with my fingers, so it won't fell off. THAT would be the heatsink job..


anyone?
Looks to me that you have no room for an extra heatsink there with the Aixiz module.
I did a 10440 build here:http://laserpointerforums.com/f65/10440-140-micro-build-58538.html

I could not fit a heatsink so decided just not to have one. The fit is tight enough that now the host itself is a heasink. Granted this, along with the battery does not allow long run times, but its all for fun and it works!

I would suggest just stuffing everything in there any way you can, wrap up the driver so it doesn't touch the host, figure out some battery contact and you should have enough room for the battery.

Good luck with your build, I do love these small builds. I'm having Mohrenberg make up some heatinks for a small 14500 build I have planned.
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Old 02-10-2011, 03:11 AM #25
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Default Re: Single 10440 build

I'll use a aluminium sleeve, that will hold the aixiz head to the host. This sleeve will be the heatsink
Thanks for giving me motivation for building this!
btw: VERY good build. What is the total runtime, so I can calculate my runtime from your mA driver setting.
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Old 02-10-2011, 03:22 AM #26
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Default Re: Single 10440 build

Quote:
Originally Posted by Leodahsan View Post
I'll use a aluminium sleeve, that will hold the aixiz head to the host. This sleeve will be the heatsink
Thanks for giving me motivation for building this!
btw: VERY good build. What is the total runtime, so I can calculate my runtime from your mA driver setting.
I haven't figured out the run time really....Seems to do okay with my general playing around for a minute or two every now and then(now there's hard data for ya') I can't remember off hand what I set the driver to, but I have put up a LPM picture so you can see at least with the a140 diode what I am getting ..... Sorry...

My build was really just to see if I could do it, get it all stuffed into the smallest host I could find. I knew runtime, heatsinking, etc were all going to be issues, but as long as that coherent light came out the end I was happy

Looking forward to seeing your build up and lasing, good luck to ya!
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Old 02-10-2011, 03:24 AM #27
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Default Re: Single 10440 build

Quote:
Originally Posted by Leodahsan View Post
^lol at larry "2.2r" res. Who is right, then?
Thanks anyways. I'll start with jib values. Dissipation?

0.433 x 3.9v? 1.56W ?
Both right ... Larry is going of the fact the cells are already current limited by their internal resistance. Im going under the assumption you have infinite current available, this way no matter what the cell you hook up or if you use a bench PSU you wont ruin your diode. I would use at least a 2W resistor.
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Old 02-10-2011, 03:25 AM #28
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Default Re: Single 10440 build

@532 with Envy
Don't feel sorry. I just ordered the diode from rayfoss and my C03 with EMS, it should be here fast (before the batteries, charger and heatsink tho )
2 minutes runtime? DAMN thats short. Lets hope mine run at least 5 minutes

@jib77
I'll be getting new batteries.. What could be their current?
I'll be getting a 10R, and a 8R resistor then. If 10R runs too weak I'll put 8r..
Thanks!

edit: the diodes are rated 2.2~3v <340mA. Possibility of driver?

edit 2: 808 posts.. I'm invisible from now.
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Old 02-10-2011, 03:32 AM #29
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Default Re: Single 10440 build

Direct drive is more efficient since you will not be diverting power for use by the IC to be wasted as heat. Saying that, LM117s are cheap, so it would not hurt to try.
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Old 02-10-2011, 03:48 AM #30
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Default Re: Single 10440 build

809 posts. I'll stick to 10R res, as the diodes operate to 500mA quite safely as I seen on some threads. Even a perfect battery (4.2v no drop = 420mA) wouldn't harm him.
Thanks jib, Larry and 532 with Envy! Any comments? I'm waiting for it!

Oh btw, should I chrome that host? Give it a silver style..
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Old 02-10-2011, 06:04 AM #31
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Default Re: Single 10440 build

Quote:
Originally Posted by Leodahsan View Post
^lol at larry "2.2r" res. Who is right, then?
Thanks anyways. I'll start with jib values. Dissipation?

0.433 x 3.9v? 1.56W ?
Direct Drive = Battery Voltage - LD Voltage / Resistor

Direct Drive = = = 3.9 VDC - 3.2 VDC / 2.2 ohms

Direct Drive = 318ma

Power < 1/2 watt

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Old 02-18-2011, 01:56 PM #32
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Default Re: Single 10440 RED LOC build

just a heads up and free bump.
The sleeve should come to my house some time. Does someone live near Hemlock_Mike? I need a help.
I bought the 10440s and charger from DX, they are *luckly* tested in 700mA discharge, 450mA capacity, by EMS that I had in another order it should come to my house in 15 days AT MOST. This will be delayed, sure.
Thanks all for helping and reading, any ideas are appreciated!
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