Forums | Home Repair | Home Improvement | Painting | Interior Decorating | Remodeling | Landscaping


Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Electrical

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Search this Thread Display Modes
Old 01-15-2009, 01:56 PM   #1
Member
 
Join Date: Jan 2009
Posts: 74
Share |
Default

Buzzing lines from lighting fixture


Hi,
I'm in the process of installing new lighting sconces in my bathroom. They each have two small 35w halogen bulbs in them, so presumably also have a transformer in them.

As soon as I turned them on I noticed that that I was getting a loud buzz from the radio in another room. I'm sure yet what other negative effects this will have on stereo, guitar amp, TV, computer etc... The fixtures are properly grounded and that doesn't appear to have any effect at all.

I'm wondering if there is some kind of filter I can install inline to minimize or eliminate this side effect? Also I'd like to install them on a dimmer switch since they are undesirably bright. Would this serve to isolate them at all?

Thanks for the help !!

Eric

Last edited by everyman; 01-15-2009 at 01:58 PM.
everyman is offline   Reply With Quote
Old 01-15-2009, 04:31 PM   #2
Member
 
Join Date: Nov 2007
Location: Nashua, NH, USA
Posts: 6,781
Default

Buzzing lines from lighting fixture


The interference you heard in your radio will probably not cause problems with computers, stereos, etc.

A dimmer is likely to make more interference, both wire borne and airborne as opposed to isolate any power line interference the lights may have created. Computers generate some airborne interference too.

Try an in-line noise filter (you plug the noise filter for example looking like a two inch cube, into a receptacle and plug the "offending" equipment into the filter). Typically it contains a capacitor that smooths off the sharp angles of the AC waveform created by certain electrical equipment including many dimmers. Spurious high frequency content in wires can radiate as airborne interference and a filter near the source cuts off those high frequencies rather than let them propagate down long lengths of wire giving more opportunities to radiate as airborne,

The sharper the waverform points or corners, the greater the high frequency content. One megahertz is right in the middle of the AM radio band.

Last edited by AllanJ; 01-15-2009 at 04:38 PM.
AllanJ is offline   Reply With Quote
Old 01-22-2009, 04:42 PM   #3
Member
 
Join Date: Jan 2009
Posts: 74
Default

Buzzing lines from lighting fixture


Quote:
Originally Posted by AllanJ View Post
The interference you heard in your radio will probably not cause problems with computers, stereos, etc.
so far this seems to be correct. Guitar amp seems silent as well.

Quote:
A dimmer is likely to make more interference, both wire borne and airborne as opposed to isolate any power line interference the lights may have created. Computers generate some airborne interference too.
Grr, that stinks. I'd love to throw these on a dimmer as they are plenty white.

Quote:
Try an in-line noise filter (you plug the noise filter for example looking like a two inch cube, into a receptacle and plug the "offending" equipment into the filter).
I don't suppose you might know where such a thing can be found? I asked at the electrical isle at the local box store and they didn't know what I was talking about. I googled a bit and everything that turned up seemed to be for car stereos or phones.


Quote:
The sharper the waverform points or corners, the greater the high frequency content. One megahertz is right in the middle of the AM radio band.
Yep, that's where it is, and unfortunately I listen to AM a lot. Maybe I should just go back to listening to music. I'd probably be better off.

Thanks for the tips, sorry for the delay. I've been caught up in other projects.
everyman is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Adding recessed lighting where old fixture was ConstantChange Electrical 4 01-15-2009 04:42 PM
Installing Lighting Fixture lilsara88 Electrical 3 01-03-2009 08:49 PM
lighting a covered, enclosed patio 1655graff Electrical 5 11-21-2007 08:06 AM
double-ended halogen fixture bulbs stop working watt-ever-ny Electrical 6 11-20-2007 05:25 PM
Old house, new light fixture, too many wires Persephonee Electrical 3 01-15-2007 08:58 AM




Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.