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Old 01-07-2012, 10:57 PM #1
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Default 3 Mode Flashlight driver for 445 build?

Hi All,

After completing my first 405 build I am now attempting to build my first 445 M140 build into a Small Sun host.

I really like the idea of having a 3 mode driver like the one that is already in the Small Sun. I will be powering it off of one 18650 3.7v cell. Is it possible to use this driver to drive a 445?

From what it looks like to me this driver appears to be a linear driver and to change the current I would have to switch out the two 1ohm resistors following the 1.25/R=mA rule?

I have a small metal lathe and have already machined a heat sink and inserted the Aixiz module with a 445 diode pressed in. All I need now is the driver

Let me know what you guy's think, this is only my second build ever


3 Mode Flashlight driver for 445 build?-6655638433_7d4c0aeaa3.jpg

3 Mode Flashlight driver for 445 build?-6655644019_e079a73aa0.jpg

3 Mode Flashlight driver for 445 build?-6655646209_392966b270.jpg

3 Mode Flashlight driver for 445 build?-6655649337_a8d3772c23.jpg

3 Mode Flashlight driver for 445 build?-6655663129_1a10e27b30.jpg

3 Mode Flashlight driver for 445 build?-6655665877_78c6957186-1-.jpg


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Old 01-07-2012, 11:04 PM #2
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Default Re: 3 Mode Flashlight driver for 445 build?

Not all linear drivers follow the 1.25/R=mA rule. The LM317/117 does but I am not sure about this driver. Did you measure the actual current from the 3-mode driver with a testload ? Maybe the current is already good for a 445nm diode.
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Old 01-07-2012, 11:13 PM #3
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Default Re: 3 Mode Flashlight driver for 445 build?

You can't power a m140 with one cell from that. You need a boost driver.
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Old 01-08-2012, 05:21 PM #4
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Default Re: 3 Mode Flashlight driver for 445 build?

So I have to scrap the 3 mode driver idea and go with something like the flexdrive?

Well maybe I will use this driver with a 405.
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Old 01-08-2012, 07:00 PM #5
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Default Re: 3 Mode Flashlight driver for 445 build?

405 needs even higher voltage than a 445!
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Old 01-09-2012, 01:52 AM #6
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Default Re: 3 Mode Flashlight driver for 445 build?

I guess I have some more reading to do
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Old 01-09-2012, 04:15 AM #7
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Default Re: 3 Mode Flashlight driver for 445 build?

With a very low dropout linear you could probably run a 650nm diode from one cell, but I think that is about it. Happy reading!
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Old 01-09-2012, 04:43 AM #8
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Default Re: 3 Mode Flashlight driver for 445 build?

Measure the current of the driver on a test load.

I imagine it's about 1A and should work well for one of the 300mw 635 diodes.
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Old 01-09-2012, 06:26 AM #9
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Default Re: 3 Mode Flashlight driver for 445 build?

You could always just use 2x 16340s (or 2x 18350s).

Generally, unless it's the absolute tightest host, you can fit the above combinations wherever a single 18650 will go. Reason:

- They make 18650 hosts capable of handling slightly longer than standard 18650s, since many cells are now coming with protection circuits that add length.
- So, even though 2x 16340 are 3mm longer (in theory), if you go unprotected, you'll have some extra margin, and it should all fit.
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Old 01-09-2012, 01:15 PM #10
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Default Re: 3 Mode Flashlight driver for 445 build?

I thought of using two Tenergy CR123's. Will the stock 3 mode driver handle double the intended voltage?
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Old 01-09-2012, 04:52 PM #11
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Default Re: 3 Mode Flashlight driver for 445 build?

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Originally Posted by Polonium210 View Post
I thought of using two Tenergy CR123's. Will the stock 3 mode driver handle double the intended voltage?
You haven't even linked us to the host, so who knows

If you link us to the original light, there might be some info about the driver. But otherwise, we're just guessing.
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Old 01-09-2012, 06:39 PM #12
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Default Re: 3 Mode Flashlight driver for 445 build?

I purchased it off eBay so there was not much info on it except that it has a 3 mode driver and runs off a single 18650 cell. Most likely the driver can take a higher voltage but the LED only needs the single cell.

http://http://www.ebay.ca/itm/260883916571?ssPageName=STRK:MEWNX:IT&_trksid=p398 4.m1439.l2649#ht_1686wt_689
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Old 01-09-2012, 06:53 PM #13
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Default Re: 3 Mode Flashlight driver for 445 build?

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Originally Posted by Polonium210 View Post
I purchased it off eBay so there was not much info on it except that it has a 3 mode driver and runs off a single 18650 cell. Most likely the driver can take a higher voltage but the LED only needs the single cell.

http://http://www.ebay.ca/itm/260883916571?ssPageName=STRK:MEWNX:IT&_trksid=p398 4.m1439.l2649#ht_1686wt_689
Some flashlights will say 1x18650 or 2xCR123 (16340). When they do, it's almost certain that they'll be fine for 445s driven from two cells. The only real different between a 445 and the LED, is that the 445 drops more voltage - which actually is better for the driver if it's a linear one, since there's less voltage for it to drop. Even a buck driver is probably happier driving a 445 from two cells than it would be driving a LED.

However, yours doesn't say that 2x CR123 (16340) are alright - so all you can do is test (with a test load).
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Old 01-10-2012, 05:14 AM #14
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Default Re: 3 Mode Flashlight driver for 445 build?

I am the proud new owner of a $50 LED

I tested the driver on a dummy load and got 960mv on my scope.
It did work for a few minutes and was damn bright!

Oh well, it was a learning experience....

I think I will try a flex drive instead.
Does anyone sell these here? Or is fleabay my only option?
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Last edited by Polonium210; 01-10-2012 at 05:14 AM.
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Old 01-10-2012, 05:38 AM #15
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Default Re: 3 Mode Flashlight driver for 445 build?

Quote:
Originally Posted by Polonium210 View Post
I think I will try a flex drive instead.
Does anyone sell these here? Or is fleabay my only option?
I think I'm going to cry.

But, if you're set on using a flex, at least get it from someone on the forum, not eBay. Try DTR, Flaminpyro, or (maybe?) Jayrob. I know the first two sell them. Not 100% sure if Jayrob does. All three are good sources to buy from
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Old 01-10-2012, 10:14 AM #16
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Default Re: 3 Mode Flashlight driver for 445 build?

i used a 5 mode LED driver from a single cell, it lases, the Vf of the 445 diode is too much for it to hit full current (around 1050mA), im not sure of the power out of my build as im waiting for my LPM to return, id imagine it would be well under 1000mW.

Here's the thread: Trustfire TR-801 5 Mode 445nm :)

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Last edited by Fiddy; 01-10-2012 at 10:15 AM.
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