I have a wireless headphone with the transmitter hooked up to my TV. The headphones are " SENTRY model HO800 ". The headphones take two AAA batteries. The transmitter takes one 9v battery. Alternate to the 9v battery is a 12 volt 200MA power pack.

... Here is the problem > when using the power pack I get a really nasty hummmmm along with the TV sound in the headphones. Is it because the manufacturer instructions said to use a 12v power pack, ( verses 9v battery ), when the instructions SHOULD have said to use a 9v power pack? Seems to me that a 9v battery should be replaced with a 9v power pack.
.... If I find a 9v 200MA power pack I will need to splice in a 12v plug end because that is what the transmitter is set up for. In either case, 9v or 12v, how important is the 200MA rating? Would 1.7amp be a bad idea? How about a filter?

Motorcycles - kawasaki - ZZR 1100 - 1996 kawasaki ZZR 1100