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Chip Amps Amplifiers based on integrated circuits

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Old 15th April 2011, 07:44 PM   #1
beamsjr is offline beamsjr  United States
diyAudio Member
Join Date: Apr 2011
Default Chipamp questions

I recently purchased a chipamp from and assimbled it. I am using a 25x2 transformer and when I am running the amp I can hear the transformer buzzing. If I touch the transformer I can feel it vibrating. Is this normal?

Also the traces going to the LED burned off when I plugged it in, so the LED does not work. I have double and triple checked my connections and cant seem to figure out what I have done wrong.

The amp works great besides these few issues and sounds great.

Here is how I have the leads going to the power supply

|--- 25 --> AC1 with the line over it
|--- 0 --> AC1

|--- 25 --> AC2 with line over it
|--- 0 --> AC2

Please let me know what you think.
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Old 15th April 2011, 09:16 PM   #2
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Join Date: Oct 2006
Can you post some photos please?

Are you using the (BrianGT) boards?

Have you installed your diodes correctly?

It sounds like there is a short circuit causing the transformer to draw a lot of current and therefore vibrate as the magnetic field fluctuates.
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Old 16th April 2011, 05:46 AM   #3
diyAudio Member
Join Date: Apr 2011
just be carfull not to pop your caps
If your power supply voltage is exceeding the "WV__ " working voltage maximum
is labeled right on your filter caps...
grab your meter and check OK
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