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Old 02-19-2012, 09:31 PM #17
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Default Re: Flashlight drivers?

Btw I never use the forum search. I like google search very much.

Use Google and put "site:laserpointerforums.com whatever" in the bar. Works much better.


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Old 02-19-2012, 09:45 PM #18
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Default Re: Flashlight drivers?

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Originally Posted by tsteele93 View Post
Another member PM'd me to point out that these drivers may be poor quality and have current spikes. So not a good idea for a high current build near the limit of the diode.

But for a lower power build, it might be worth it to get some of the effects, like low power and strobe that a lot of the flashlights come with?

Might be worth trying on some cheap reds?
Yes LED's are much more robust than diodes so their drivers don't need to smooth out the spikes as much but there have been some that have been successfully used with the 445's as they are really tough compared to any of the other diodes we had been using previously. The NJG is an example but even that driver when tested showed it had a some good spikes when probed. As far as trying them with cheap red diodes or other lower power diodes would be more at risk as they really can't handle spikes nearly as well as the 445's or even these new high power 635's which is why we use driver that were built with that in mind.

This was one of the first real informative threads on the subject I remember reading when I first got into this hobby. I think it may still be a sticky.

Laser driver - It can be done

Last edited by DTR; 02-19-2012 at 09:47 PM.
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Old 02-20-2012, 12:44 AM #19
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Default Re: Flashlight drivers?

Quote:
Originally Posted by DTR View Post
Yes LED's are much more robust than diodes so their drivers don't need to smooth out the spikes as much but there have been some that have been successfully used with the 445's as they are really tough compared to any of the other diodes we had been using previously. The NJG is an example but even that driver when tested showed it had a some good spikes when probed. As far as trying them with cheap red diodes or other lower power diodes would be more at risk as they really can't handle spikes nearly as well as the 445's or even these new high power 635's which is why we use driver that were built with that in mind.


Laser driver - It can be done
What if you add a cap to smooth the spikes? Any help?

http://www.ecircuitcenter.com/Circui...ss/cbypass.htm
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Old 02-20-2012, 01:39 AM #20
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Default Re: Flashlight drivers?

I checked one from the DX 4-pack on the scope a while back and it came up clean.
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Old 02-22-2012, 03:05 PM #21
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Default Re: Flashlight drivers?

I would like to see a 445 build with a host such as Jet Beam, Eagle Tac, or Nitecore with an infinitely variable dial which could control the output of the laser. Would this be possible? If so, who can build me one??
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Old 02-23-2012, 12:35 AM #22
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Default Re: Flashlight drivers?

Quote:
Originally Posted by peteschlabar View Post
I would like to see a 445 build with a host such as Jet Beam, Eagle Tac, or Nitecore with an infinitely variable dial which could control the output of the laser. Would this be possible? If so, who can build me one??
Those are awesome, but the Jetbeam is $110.00 so you are starting with an expensive host right off...
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Old 02-23-2012, 02:45 AM #23
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Default Re: Flashlight drivers?

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Originally Posted by tsteele93 View Post
Those are awesome, but the Jetbeam is $110.00 so you are starting with an expensive host right off...
True, but you know it would be worth it when it was complete
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Old 02-23-2012, 03:24 AM #24
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Default Re: Flashlight drivers?

Quote:
Originally Posted by peteschlabar View Post
I would like to see a 445 build with a host such as Jet Beam, Eagle Tac, or Nitecore with an infinitely variable dial which could control the output of the laser. Would this be possible? If so, who can build me one??
Lol *hand goes up*. I've got two V20As en route for just that purpose. Though not really intending to sell them, but rather make a matching variable 635 and 445 for my own collection

EDIT: One follow-up point:

I've seen the Driver Mod For up to 1.8amps with 2x 3.7v or 3.0v cells thread a whole number of times. I've read it off and on. Something that has always peaked my curiosity though, is why all the amperages seem to have been replaced by the letters "XX".

Was there some sort of legal / liability issue? Was Ave asked to censor the post for some reason?
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Old 02-23-2012, 06:45 AM #25
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Default Re: Flashlight drivers?

Quote:
Originally Posted by rhd View Post
I've seen the Driver Mod For up to 1.8amps with 2x 3.7v or 3.0v cells thread a whole number of times. I've read it off and on. Something that has always peaked my curiosity though, is why all the amperages seem to have been replaced by the letters "XX".

Was there some sort of legal / liability issue? Was Ave asked to censor the post for some reason?
Yeah, those XXs make me sad.
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Old 02-23-2012, 07:16 AM #26
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Default Re: Flashlight drivers?

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Originally Posted by Ghostchrome View Post
Yeah, those XXs make me sad.
They don't make me sad - just curious as to the story behind them.
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Old 02-23-2012, 07:30 AM #27
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Default Re: Flashlight drivers?

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They don't make me sad - just curious as to the story behind them.
I don't know the story but those are AX2002 ICs, current is calculated by I = 0.25/R so no big deal anyone can use it it's free as in the datasheet?
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Old 02-23-2012, 07:38 AM #28
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Default Re: Flashlight drivers?

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I don't know the story but those are AX2002 ICs, current is calculated by I = 0.25/R so no big deal anyone can use it it's free as in the datasheet?
Weird co-incidence:
- I have a small strip of .33 ohm SMD 0805 resistors staring at me from the DIY boost testing. If I just parallel one on, I should get about 1.7A out.

I know that I've got some of these drivers somewhere. I'll go give it a shot.

EDIT: Either of these, if paralleled with the existing 0.27 ohm resistor, should result in around 1750 mA
http://search.digikey.com/ca/en/prod...QCT-ND/1853077
http://search.digikey.com/ca/en/prod...0FCT-ND/433026
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Old 02-23-2012, 08:00 AM #29
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Default Re: Flashlight drivers?

Quote:
Originally Posted by rhd View Post
Weird co-incidence:
- I have a small strip of .33 ohm SMD 0805 resistors staring at me from the DIY boost testing. If I just parallel one on, I should get about 1.7A out.

I know that I've got some of these drivers somewhere. I'll go give it a shot.
if you parallel 2x 0.33ohm resistors you will get 0.165ohm
0.25 / 0.165 = 1.5151515151A so you will get around 1.5A with those

if you parallel 1x 0.33ohm and 1x0.20ohm you will get 0.12453
0.25 / 0.12456 = ~2A

you need 0.147 ohm resistance for 1.7A you need other resistors to parallel
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Old 02-23-2012, 08:09 AM #30
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Default Re: Flashlight drivers?

Quote:
Originally Posted by foulmist View Post
if you parallel 2x 0.33ohm resistors you will get 0.165ohm
0.25 / 0.165 = 1.5151515151A so you will get around 1.5A with those

if you parallel 1x 0.33ohm and 1x0.20ohm you will get 0.12453
0.25 / 0.12456 = ~2A

you need 0.147 ohm resistance for 1.7A you need other resistors to parallel
If the stock is 925mA, that implies a 0.27 ohm stock resistor. If you parallel a 0.3 ohm resistor with 0.27 ohm, you should have 0.142 ohms. That should yield 1.76A.
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Old 02-23-2012, 09:03 AM #31
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Default Re: Flashlight drivers?

Looks like stock is actually 0.2 ohms, making 0.5 ohms a good solution to parallel in.
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Old 02-23-2012, 10:05 AM #32
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Default Re: Flashlight drivers?

Quote:
Originally Posted by rhd View Post
If the stock is 925mA, that implies a 0.27 ohm stock resistor. If you parallel a 0.3 ohm resistor with 0.27 ohm, you should have 0.142 ohms. That should yield 1.76A.
aah.. I thought the stock was 0.2ohm resistor
yes, that will work then

Last edited by foulmist; 02-23-2012 at 10:07 AM.
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