I have an issue with a loud buzz or hum coming from a speaker and am searching for a component that can reduce this noise.
There is mains power to an ac/dc converter powering the amplifier. Audio input to the amp is by an mp3 player that is also powered by the mains. When the ac/dc converter is plugged into the mains we get a loud buzzing from the speakers. This is fixed by powering the amp with a battery but this isn't ideal as we need constant power. However, if the mp3 player is plugged into the mains we still get the noise when the amp is powered by the battery. I think this might be a ground loop problem, have seen a product called hum x advertised but this is only available for us mains power. So am looking for a solution for the uk. Have seen ground loop isolators with red and white phono plugs but this would only work between the mp3 player and the amp for the audio input, can't find a device that would work for the ac/dc adapter.
The specs are as follows:
Ac/dc adapter: laptop charger 16v, 3.5A, 56W
Amplifier: Kemo 40W, 16V, 4-8 ohms http://www.maplin.co.uk/40w-power-amplifier-module-37737
Mp3 player: plugged into usb adapter to mains for charge
Speaker: UW30. 30W 8 ohms http://www.lubell.com/UW30.html
Please can you advise any solutions to this problem?
There is mains power to an ac/dc converter powering the amplifier. Audio input to the amp is by an mp3 player that is also powered by the mains. When the ac/dc converter is plugged into the mains we get a loud buzzing from the speakers. This is fixed by powering the amp with a battery but this isn't ideal as we need constant power. However, if the mp3 player is plugged into the mains we still get the noise when the amp is powered by the battery. I think this might be a ground loop problem, have seen a product called hum x advertised but this is only available for us mains power. So am looking for a solution for the uk. Have seen ground loop isolators with red and white phono plugs but this would only work between the mp3 player and the amp for the audio input, can't find a device that would work for the ac/dc adapter.
The specs are as follows:
Ac/dc adapter: laptop charger 16v, 3.5A, 56W
Amplifier: Kemo 40W, 16V, 4-8 ohms http://www.maplin.co.uk/40w-power-amplifier-module-37737
Mp3 player: plugged into usb adapter to mains for charge
Speaker: UW30. 30W 8 ohms http://www.lubell.com/UW30.html
Please can you advise any solutions to this problem?