I am trying to fix an issue with my computer/headset. I just got an analog headset for Christmas and whenever I use the mic people say I have a buzzing noise along with my voice.(And when i test it with loopback i hear it too). However, whenever i disconnect my AC adapter, the buzzing stops and i sound clear. I believe this has something to do with the conversion from AC to DC in my adapter? Am I correct? If I am, is there something i can do to stop the buzzing noise? or is there other power adapters out there that doesn't do this?
That power supply you have for your laptop is faulty. There should be no AC ripple at all at the terminals where it connects to the laptop. This alone, will affect the way your battery is being charged. Batteries require VERY smooth DC with a minimal amount of AC ripple. My advice would be to send it back under warranty, as it is not doing it's basic function.
I had a similar situation occur when using USB devices that have their own power supply. In my case, it was a USB hub that was causing the problem. The hub was capable of being powered by the host computer's USB port OR with the included power supply but not both. When I did away with the hub's power supply connection, all audio devices were crystal clear. The computer's USB port was able to provide sufficient power to run the hub.
I have a lot of stuff hooked up to my audio bus here (goes to several output devices) and I ended up needing a decoupling transformer on some of the things to prevent AC hum. The worst offender is the PC itself.