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Batteries are "screaming"

MrMcChicken

MrMcChicken

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Mar 6, 2011
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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.
 





Strange..... :thinking:
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
 
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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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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That or the little gnomes inside of the batteries are in pain...
 
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?
 
@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!
 
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.
 
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.
 
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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