For the last couple of years we've been using a cheap tablet computer to store our music, with an external amplifier plugged into the headphone jack, driving a pair of speakers. The computer and the amp run off separate wall-wart power supplies. This setup has worked well, but a few weeks ago the tablet decided it just didn't want to work any more, so I dumped it and got another one. Now any time the tablet is connected to its power supply, there's a buzzing coming from the speakers. My ear isn't good enough to detect it when there's music playing, but it's certainly audible when there's no other sound. It doesn't happen when the tablet is running off its battery.
If I saw this item posted, I might suggest "Try the new tablet with the power supply for the old one". I've done that, and the buzzing sound is worse on the other supply, but the old computer never made any obnoxious sounds. So now I'm thinking that I should cut the cord from the power supply and add filter components, then splice it back together. I'm skeptical about whether this will work, though. Has anyone got an idea of what might be happening?
If I saw this item posted, I might suggest "Try the new tablet with the power supply for the old one". I've done that, and the buzzing sound is worse on the other supply, but the old computer never made any obnoxious sounds. So now I'm thinking that I should cut the cord from the power supply and add filter components, then splice it back together. I'm skeptical about whether this will work, though. Has anyone got an idea of what might be happening?