Identify part on SI T-amp pcb (I burned it...) - diyAudio
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Old 17th September 2008, 11:20 AM   #1
jaste is offline jaste  Sweden
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Default Identify part on SI T-amp pcb (I burned it...)

Hi! Coming home late at night dying to get into bed and fall asleep listening through my new t-amp I accidentely mixed the polaritys on my batteri and the t-amp started smoking...
From what I can see there is only one little part damaged and I thought I might as well try to replace it and see if it works.

The part is labeled "FB5" on the pcb and it looks like this:

Click the image to open in full size.

Can someone please tell me what it is?
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Old 17th September 2008, 11:51 AM   #2
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It is either a fuse or a ferrite bead. I have never had that board so can't be more precise.
If you promise not to make the same mistake again you could just bridge that item. Also you should check FB9.
To check that they have been damaged you will need to read the resistance across them with a meter set to ohms, should read something close to zero.
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Old 17th September 2008, 12:45 PM   #3
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I don't know why that picture has the ferrite beads labeled "fuses". They are there for EMI suppression, not as fuses.

Anyway, that burned ferrite bead is probably the least of your problems. There is a good chance the IC is toast.
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Old 17th September 2008, 02:38 PM   #4
jaste is offline jaste  Sweden
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Thank you very much for your help! If I would like to by a new feriite bed to solder in place instead what should I look for?
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Old 17th September 2008, 02:57 PM   #5
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You don't need to buy a new ferrite bead to see if the board is still functional or not. If it is burned open circuit you can just jumper the pads with a piece of wire. It's not a critical component, so if the amp is still good it should work without it.
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Old 19th September 2008, 03:28 AM   #6
Pano is offline Pano  United States
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It's a Ferrite Bead. Used to clean up the incoming power.

You can replace it with a wire jumper - or a fuse, or a diode (to keep reverse polarity out)
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