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Old 07-27-2012, 02:17 PM #1
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Cool Poof

Ok... so I believe I know what happened... but I would like to know what you think happened... I have a microboost driver set at 1.7a with an M140 diode... and just because I am still waiting on my battery to arrive, and just to test out the new diode... I attached 3AA batteries. I ran it for around 30 seconds before I heard "POP". I immediately switched off power and noticed that one of the batterie's end cap popped open and a green liquid was oozing out...


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Old 07-27-2012, 02:20 PM #2
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Default Re: Poof

Did you hooked something to the driver output ? The boost drivers mustn't run without a test load or a diode.
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Old 07-27-2012, 02:26 PM #3
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Default Re: Poof

I believe I mentioned that it was connected to an M140 diode
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Old 07-27-2012, 02:28 PM #4
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Default Re: Poof

If you ran it through the driver you should be ok. Sounds like you exceeded the max current the batteries could handle. Did you also have the diode in a module or better still a heat sink?

Edit: Blord was asking if you ran the diode directly off the batteries (ie by passed the driver) or whether you ran the diode through the driver.
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Old 07-27-2012, 02:32 PM #5
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Default Re: Poof

The diode was in a module placed into an aluminum heatsink with thermal paste. Thats what I believe happened... the current hungry driver taxed the poor AA batteries beyond their capability...
lol! so much to learn with this new obsession of mine!
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Old 07-27-2012, 02:33 PM #6
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Default Re: Poof

You already hooked up to the diode. I misread you are waiting for the new battery and not the new diode.
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Old 07-27-2012, 02:38 PM #7
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Default Re: Poof

Yeah, that's another thing I'm trying to learn... being more specific... Yes, I had the M140 diode attached to the microboost driver which is set at 1.7a. I had the driver connected to 3AA batteries. Thanx for your replies!
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Old 07-27-2012, 03:10 PM #8
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Default Re: Poof

What kind of AAs? Alkaline electrolyte is clear, not green.
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Old 07-27-2012, 03:11 PM #9
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Default Re: Poof

Alkaline... I had my goggles on AND I'm color blind! lol... so...
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Old 07-27-2012, 03:27 PM #10
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Default Re: Poof

Any pics?

Also, did you notice that the batteries got hot?

If not, it might not have been that the batteries were heavily stressed. Defective, perhaps?

Cheers!
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Old 07-27-2012, 03:33 PM #11
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Default Re: Poof

Do you any pictures of the batteries/setup? I have never had a green liquid come out of any of my batteries before. Unfortunately a couple days ago I had 3 D batteries burst and spill a light brown goo everywhere. Got all over my hands and stained a carpet. They were just normal generic alkaline batteries though.
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Old 07-27-2012, 10:04 PM #12
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Default Re: Poof

I thought this was a gay Thread from the title....
IIRC in the UK a Poof is a homo***ual....

NVM.... carry on..


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Old 07-28-2012, 02:22 AM #13
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Default Re: Poof

So I made a quick video... of me doing a current measurement... The heatsink is barely warm, the batteries are cool to the touch... however, the diode goes into blink mode after a very short time... I am using 3 alkaline D batteries. (I know.... I know... I am still waiting on my good battery...)

So what do you think is causing the diode to go into blink mode? It has to be the batteries... right?

Laser Current Test - YouTube


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Old 07-28-2012, 04:11 AM #14
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Default Re: Poof

The driver is overheating and bouncing off the thermal protection.

Did you heatsink it like in this thread?

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Old 07-28-2012, 05:42 AM #15
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Default Re: Poof

nope
About to try it when my thermal paste dries!

thanks, DTR, as always!!!


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The driver is overheating and bouncing off the thermal protection.

Did you heatsink it like in this thread?

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