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Old 07-14-2010, 06:45 PM #1
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Default CLOSED - 445 build flicker problem - CLOSED fixed thank you all!

Ok, so I know this was mentioned in a couple of other posts some where and it turned out to be the battery. I have checked the battery (aw 18650) and a few others and they all do the same thing (all have a full charge). I have the boost driver set to 532ma.

So what happens is it turns on for a about 2-4 seconds, then starts to flicker / strobe. Could this be the multimode? Bad solder connections? Dying diode?

Specs.
Using a ultrafire a10b host
FP's heatsink
microboost set to 532ma (bridged at the 390-750ma pad)
aw p18650 battery (full charge)
a130 diode


Thanks for the help.



Last edited by designedfor1; 07-14-2010 at 08:14 PM.
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Old 07-14-2010, 06:50 PM #2
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Default Re: 445 build flicker problem

with laser off see if anything rattles when you shake it.. not too hard though. i had a similar prob.... and it was a loose - connection due to my poor assembly.

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Old 07-14-2010, 06:53 PM #3
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Default Re: 445 build flicker problem

the only thing that rattles is the AL washer that goes around the spring at the top.
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Old 07-14-2010, 06:57 PM #4
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Default Re: 445 build flicker problem

What's the current draw from the battery? It might simply not be able to supply enough current.
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Old 07-14-2010, 07:01 PM #5
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Default Re: 445 build flicker problem

These are the specs. from the aw battery im using:

Capacity : 2600mAH ( rated at 0.2C discharge 4.2V - 2.8V @ 25℃ )
Operating Temp. : Charge 0 to 45℃ / Discharge -20 to 60 ℃
Max. Charge Rate : 2.6A ( ambient temp. 25 ℃ )
Max. Discharge Rate : 5.2A ( ambient temp. 25 ℃ )
Dimensions :18.52 X 68.16mm ( +/- 0.3mm )

I'm not sure where to measure the current draw from the battery with the host complete.
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Old 07-14-2010, 07:02 PM #6
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Default Re: 445 build flicker problem

Are they from a reputable company? Chinese specs aren't necessarily worth the paper they're written on. It'd be useful if you could measure the actual current draw from the batteries nonetheless.
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Old 07-14-2010, 07:04 PM #7
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Default Re: 445 build flicker problem

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Originally Posted by charliebruce View Post
Are they from a reputable company? Chinese specs aren't necessarily worth the paper they're written on. It'd be useful if you could measure the actual current draw from the batteries nonetheless.
It's the AW brand batteries. They are highly referred by many vets.
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Old 07-14-2010, 07:07 PM #8
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Default Re: 445 build flicker problem

I'd personally measure the current draw, and try it with a second power supply (preferrably a stable bench supply, if you have one available). I'm guessing there's nothing visibly shorted on the driver, and nothing is getting too warm?
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Old 07-14-2010, 07:10 PM #9
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Default Re: 445 build flicker problem

did you solder your jumpers on the driver yourself? well either way check with a magnifying glass that they are all clean and good connections too.

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Old 07-14-2010, 07:12 PM #10
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Default Re: 445 build flicker problem

Quote:
Originally Posted by charliebruce View Post
I'd personally measure the current draw, and try it with a second power supply (preferrably a stable bench supply, if you have one available). I'm guessing there's nothing visibly shorted on the driver, and nothing is getting too warm?
There is nothing visibly shorted on the driver (a few close areas). As far as the heat I didn't feel anything getting warm when setting the current. I haven't powered the laser on long enough for it to try to get warm (maybe 10 seconds at most).

I don't have a bench power supply unfortunately. Is it possible to measure the current draw with the battery?

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did you solder your jumpers on the driver yourself? well either way check with a magnifying glass that they are all clean and good connections too.

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Yes, I did. I didn't solder the entire pad, just about have of the pad.
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Old 07-14-2010, 07:24 PM #11
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Default Re: 445 build flicker problem

Quote:
Originally Posted by designedfor1 View Post
Is it possible to measure the current draw with the battery?
To measure the current DRAW:

With an amnmeter (multimeter) in the high range, just bypass the switch using the multimeter probes and that should give a reading. That means that, if it's a tail-cap switch, you would unscrew that, and touch one probe on the casing/threads, and the other on the battery terminal where the tailcap's spring would be touching.
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Last edited by charliebruce; 07-14-2010 at 07:48 PM. Reason: Made it clear that I was referring to draw rather than diode current, thanks Dave.
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Old 07-14-2010, 07:27 PM #12
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Default Re: 445 build flicker problem

Quote:
Originally Posted by charliebruce View Post
With an amnmeter (multimeter) in the high range, just bypass the switch using the multimeter probes and that should give a reading.

If it's a tail-cap switch, unscrew that, and touch one probe on the casing/threads, and the other on the battery terminal where the tailcap's spring would be touching.

Just a reminder -- This will give you the current draw at the battery. It will NOT give you the current to the diode.

Peace,
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Old 07-14-2010, 07:29 PM #13
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Default Re: 445 build flicker problem

Is this laser in a host that uses the case as one of the power leads? (case positive,
case negative). I have had a laser that flickered because it had a slight amount of
oxidation where the driver connected to the host. Once i cleaned it up and it made
a solid connection to the host the flickering went away.
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Old 07-14-2010, 08:11 PM #14
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Default Re: 445 build flicker problem

I found the problem! I think it was a mix of the half soldered pad and bad solder connections at the diode. I want to thank everyone who contributed to help. All of the suggestions made me rethink my solder joints.

I was soldering from one direction and it only filled half of the diode solder pad.

thank you again and +1 for everyone!
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