Sound Interference on TV

[corkbuoy]

Hi

When my satellite receiver is connected to 12v and I am connected to mains I am gatting a buzzing sound on the TV. This stops if I disconnect from mains or run the satellite receiver using the mains adaptor. Any suggestions how to fix this ?

corkbuoy

 

[Wildman]

make sure everything shares a common earth.

 

[corkbuoy]

make sure everything shares a common earth.

Thanks Wildman, not sure what you mean. Both the TV and sat receiver are powered from the same 12v socket - is this OK ?

 

[pappajohn]

sounds like interference from your onboard charger.....a ferrite ring on the wires feeding the 12v socket might help.

 

[scotjimland]

I agree with papa,

The interference will be from the charger which in all probability has a un smoothed DC output rather than a smooth which you get from a proper 12v power supply.

Switching off the charger will prove it, and you could watch TV with it off, but you risk flattening the battery.

If it works ok on mains with the adapter why worry .. ?

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[corkbuoy]

Thanks, I'll try that, Maplins appear to stock these.
I prefer to leave the tv and sat receiver connected to 12v and not have the bother of switching between 12v and mains adaptor.

Pat