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Old 04-02-2012, 06:22 PM #1
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Default Batteries are "screaming"

Hi all, I have bought a some cheap AAA 1,5V batteries. I put them into my new 405nm build (for a look, click the link in the signature).
Then I switched it on and sometimes the batteries are making noises.

It sounds like they would screm. Is this normal? The laser works quite well on them.


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Old 04-02-2012, 06:28 PM #2
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Default Re: Batteries are "screaming"

Strange.....
Are you sure that the sound is coming from the batt's and not from the driver ?
Where did you buy the batt's from ?

Jim
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Old 04-02-2012, 06:34 PM #3
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Default Re: Batteries are "screaming"

Okay, it could be the battery, or the driver too, I'm not shure. The batteries are from an supermarket.
What does it mean if something of the compnents makes noise? Could i have troubble with it? :/
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Last edited by MrMcChicken; 04-02-2012 at 06:34 PM.
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Old 04-02-2012, 07:02 PM #4
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Default Re: Batteries are "screaming"

The driver is a boost driver. They have a switching frequency that is usually several tens of kHz, but sometimes the frequency is low enough that you can hear components on the board vibrating at the fundamental. It is normal and nothing to worry about.
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Last edited by Cyparagon; 04-02-2012 at 07:08 PM.
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Old 04-02-2012, 07:45 PM #5
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Default Re: Batteries are "screaming"

That or the little gnomes inside of the batteries are in pain...
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Old 04-02-2012, 08:00 PM #6
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Default Re: Batteries are "screaming"

AAA's don't have much of a discharge rate. You may need to get a Li-Ion. Is it a microboost unit that I sent you?
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Old 04-02-2012, 08:08 PM #7
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Default Re: Batteries are "screaming"

Quote:
Originally Posted by Le Quack View Post
That or the little gnomes inside of the batteries are in pain...
This is the correct answer. Ignore all others.
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Old 04-03-2012, 07:19 PM #8
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Default Re: Batteries are "screaming"

@DTR: yes it is the micro boost driver.
But if I don't have anything to worry about, it doesn't matters .
Just hoping the gnomes don't come out

Thanks all for help!
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150mW 405nm RIP HOMEMADE!
500mW 405nm pen HOMEMADE!*click me HARD*
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http://laserpointerforums.com/f49/di...tml#post952546
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Old 04-04-2012, 01:30 AM #9
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Default Re: Batteries are "screaming"

What you are hearing is probably similar to a camera flash charging... just a switchmode power supply operating at audible frequency. Usually its nothing to worry about, and can be remedied by securing inductor wirings with some epoxy resin or glue.
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Old 04-04-2012, 01:48 AM #10
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Default Re: Batteries are "screaming"

Yep. Some drivers just do that. I've only had it happen with a cheap 405 pen, but from what I can tell, it doesn't seem to cause any issues.
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Old 04-08-2012, 03:39 PM #11
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Default Re: Batteries are "screaming"

Like others have said, it is probably the driver. If you still think it is the batteries, stretch the springs so that they'll put a little bit more pressure on the battery.
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