Electronics > Beginners
What is this item found on a PCB?
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xavier60:
spherical activated carbon beads from this manufacturer can be 0.7mm average diameter, http://www.kureha.com/pdfs/Kureha-BAC-Bead-Activated-Carbon.pdf
windsmurf:
So that must have come out of the hard drive in the Tivo?
upl8:

--- Quote from: mikeselectricstuff on April 15, 2019, 12:38:30 pm ---Seems to have some PCB-trace like patterns on the surface - were there PCB tracks under it?
If so it could maybe some kind of humidity or maybe motion /shock sensor. Are the balls conductive?

--- End quote ---

He doesn't remember seeing any tracks under it. I don't think the balls are conductive, they stick to the side of the case if you shake it (static).



--- Quote from: Psi on April 16, 2019, 12:05:11 am ---It looks the same as thing thing from inside a HDD, just a different plastic package
https://youtu.be/5pP2tcsCnrk?t=85
I stand by my first guess

--- End quote ---

Yes, I think your are right. Even the texture of the balls looks the same under magnification.



--- Quote from: xavier60 on April 16, 2019, 02:37:36 am ---spherical activated carbon beads from this manufacturer can be 0.7mm average diameter, http://www.kureha.com/pdfs/Kureha-BAC-Bead-Activated-Carbon.pdf

--- End quote ---

Size looks about right.



--- Quote from: windsmurf on April 16, 2019, 03:34:10 am ---So that must have come out of the hard drive in the Tivo?

--- End quote ---

I asked him today. Not from inside the drive, but it was attached to the PCB on the drive. I didn't know this until today.

So it looks like this might be a desiccant and/or filter attached by the HDD manufacturer. Found an image that looks very similar.

Thanks all for your suggestions, I think the mystery is solved.


mikeselectricstuff:

--- Quote from: upl8 on April 16, 2019, 10:10:42 am ---
He doesn't remember seeing any tracks under it. I don't think the balls are conductive, they stick to the side of the case if you shake it (static).


--- End quote ---
they would stick regardless of conductivity
upl8:

--- Quote from: mikeselectricstuff on April 16, 2019, 11:25:15 am ---they would stick regardless of conductivity

--- End quote ---
Is that because the balls are contained in an insulating case?
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