I purchased a Lepai LP-2020A+, which is a pretty good little amp for the price, but I've modified it to make it much better and decided it deserved a better casing to look the part, too. So I constructed a little elegant wooden housing for the amp, to get rid of that carry (an attempt to adjectivise the noun car!) appearance.
I assumed the amp's original aluminum housing worked as a sort of Faraday's cage to avoid external electrical signals from coming inside the system, so I covered the inside of the wooden housing with several layers of aluminum tape that's in contact with the original front and rear aluminum panels (which I kept, because they looked rather good on the finished product), thus effectively closing the Faraday cage of sorts.
So everything's generally fine. There's no outside signals getting in, no more noise than there was before, at any rate. However, when one touches the amp (even when one touches the wooden housing, which is strange), normally when one's turning up or down the volume, turning the device off, one gets some electrical noise.
One thing I thought might work was connecting the front and back panels to the device's ground (as you can see in the photo, the potentiometer is already connected to the device's ground). I've tried this, however, and the noise is still there.
I'm wondering if anyone might have any idea of how I can get rid of this noise that only appears when one touches the amplifier.
I'm including a photo of the LP-2020A+'s PCB as it arrived (yes, the noise was there even before I modified the components). Hope someone out there can give me a hand! Any info will be greatly appreciated!