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Old 12th May 2009, 03:26 PM   #1
wwenze is offline wwenze  Singapore
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Join Date: Mar 2008
Default Why is my amp vibrating?

I'm trying out one of those Chinese amp one can get off ebay and taobao. It's an LA4625-based chip amp.

It is vibrating a little when turned on. If I up the volume and the bass it will vibrate more and to the beat.

Could it be the transformer? But there is no coil whine, transformer buzz.

Other than the transformer, is there anything else that can move inside an amp? Dun tell me transistors can vibrate if you push it too hard.
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Old 12th May 2009, 03:48 PM   #2
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Location: Cascais
Default Re: Why is my amp vibrating?

Originally posted by wwenze
Dun tell me transistors can vibrate if you push it too hard.

That's exactly what is going on. Some heatsinks make this a lot worse and sing. And people are surprised that solid state gear requires good support for optimal sound.
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Old 13th May 2009, 12:02 PM   #3
Stuey is offline Stuey  Australia
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Location: Perth, Western Australia
If it is the heatsink, you can place small rubber pads in between the fins to minimise it.
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Old 13th May 2009, 12:50 PM   #4
tinitus is offline tinitus  Europe
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Use a wooden stick placed against your ear, and touching various parts you may be able to locate the problem
A bit scary to hear how much mechanical noise there is in a simple amp
Mostly a lot comes from transformer
Even if its apparently not audible, it will be with the stick
sometimes we know very little, and sometimes we know too much
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Old 13th May 2009, 03:50 PM   #5
star882 is offline star882  United States
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Check the inductors and the capacitors.
"Fully on MOSFET = closed switch, Fully off MOSFET = open switch, Half on MOSFET = poor imitation of Tiffany Yep." - also applies to IGBTs!
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