House Ac line noise

[M Fowler]

So I have been trying to figure out if the aweful AC line noise in my home is from my house or outside caused.

However, in the mean time can I simply use an isolation transformer on my work bench to squash this harsh noise? Any suggestions for a good filtering unit?

It appears in every amp I own which never had a problem with line noise before.

In the mean time I will continue my search for which circuit may be the cause.

Mark

[LOUDthud]

Can you hear the noise on an AM radio?

[markr14850]

So I have been trying to figure out if the aweful AC line noise in my home is from my house or outside caused.

Does anyone nearby have a string of LED Christmas tree lights running? That makes some crazy noise.

[M Fowler]

Well tonight I removed three helix light bulbs and I see someone screwed in three more in my garage lately.

I told everyone we don't use those. I had this problem before with those noise inducing bulbs. Off to Menards tomorrow to get different bulbs and see if that helps.

[Cliff Schecht]

Mark I have used AC line filters in amps before and did find a dramatic reduction in noise caused by noisy AC lines. A lot of the plugs in my house are two prong and I get a nice loud pop in my surround computer speakers every time the AC kicks on. When I run the speakers off of a line filtered wall strip, the noise transients are killed. Same in my amps, I can hear when a big motor kicks on in my amps until I add a line filter.

If you don't have one and want to try one out, I have more than I could ever use and would send you one free if you paid shipping.
[img:800:508]http://www.syntaur.com/images/4015-Lg.jpg[/img]

[Reeltarded]

omg I didn't know that thing existed.

Thanks for bringing it up, Mr. Cliff!

[Gibsonman63]

Cool, Cliff. Where do you order those?

[brentm]

Would using a ferrite bead on the power cable help reject unwanted noise?

[M Fowler]

Cliff that would be a good idea to start using those., thanks.

[Aurora]

not tryin' to be the "wise guy" around here, but those filters have been standard in instrumentation electronics for decades now. Most of them are LC or CLC some form or another, - some rely on ground for proper function, some are not..
just look at the schematic in Cliffs picture...

Mark - what's going on in your neighbourhood??
Any heavy power users in your local grid, like heavy machinery??

EDIT: Filters like that are also common on most modern "what-have-you" with switch-mode PSUs, to prevent noise from getiing OUT of those units...

[davent]

Being cheap i've been using DIY RFI filter's rather then buying the integrated IEC/RFI inlet.

[IMG:800:600]http://i216.photobucket.com/albums/cc30 ... G_0775.jpg[/img]

[IMG:640:393]http://i216.photobucket.com/albums/cc30 ... Filter.jpg[/img]

dave

[M Fowler]

I doubt if there are heavy users on my grid I'm in a suburb with no business around.

But all of a sudden all my amps started this horrible raspy buzz. This is even Redplate amp and Dr Z amps that had no hum not just my builds.

In a prior post awhile ago I mentioned I found this helix light bulb at the base of my basement stair way when I replaced that bulb my noise completely subsided. Now I have the same damn noise and found six bulbs last night which I replaced today and same noise. I have been going around unplugging fridges and anything attached to the wall. I need to get some help and continue with switching the breakers to the house and see if I can isolate the area. Must exclude my home before I decide its grid related.

Mouser has a lot of those IEC filters rated for many different amps and they have a data sheet showing internal schematic.

Mark

[ApexJr.]

Cool, Cliff. Where do you order those?

I have a bunch of these in stock at $2.00 each
IEC receptacle with 6 Amp filter
http://www.apexjr.com/images/APEXJREMIFILTER1.jpg
listed on my jack page on my website

Steve

[C Moore]

It is the shared/crappy ground as much as anything.
Put your chosen room on a dedicated circuit....copper rod into the ground.....you will not need any "filtering". I was amazed at the problems it solved in our house.
RF would be another issue.
Best

[M Fowler]

Behind a bush there was a landscaping light power transformer plugged into an outdoor receptacle that I didn't know about.