That dreaded hum
Hello all, I hope I'm in the right place and my question is what can I do to get rid of a ground loop hum in my rig. The particulars: I have my audio and video hooked together and when I want to watch dvds I have to disconnect my cable from the wall to eliminate the hum. I know Mondial used to make a box for this problem but that was many moons ago. I thank you in advance and happy Memorial day.
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- 11 posts total
You can still buy the Mondial at "Music Direct" for $99 but there are lots of examples of these isolators. This is the cheapest I've seen: http://www.partsexpress.com/pe/showdetl.cfm?&DID=7&Partnumber=180-075 |
I had the same problem. This was my solution. Went to Radio Shack and bought a small plastic box, 2 switches, 4 RCA jacks and frabricated a switch box. Toggle switches turn audio signal off/on from TV's audio "Output" jacks. Needed one extra set of interconnects. Works perfectly. The reason I did it this way was because my cable reception is excellent and I didn't want to take any chances messing up the video signal. |
As noted above, the Mondial device is still available, and there are other similar solutions. Before doing anything else, I would suggest to check to ensure that the installed cable connection coming into your house is grounded correctly. Many older installations are not. If you watch current cable installation techs, (at least Comcast here in Washington) they are pretty careful to be sure to mount a gounding adaptor at the house entrance (either pass-thru or tee fitting) that has a solid ground lug connection that is then bonded to the household ground system. In many cases, this will eliminate the ground loop all by itself. |
- 11 posts total