Great Lakes 4x4. The largest offroad forum in the Midwest banner
1 - 9 of 9 Posts

·
Geocacher!!!!!!!!!!
Joined
·
2,730 Posts
Discussion Starter · #1 ·
I have a dimmer switch on the chanelier in my dinning room.
If it is set anywhere between max bright or max dim, it will
make a buzzing sound. not real loud but audible nearby.
Is there something wrong or is this normal?
Replaced it with a new one the other day and the new one
does the same thing.
 

·
Premium Member
Joined
·
3,759 Posts
http://home.howstuffworks.com/dimmer-switch5.htm

Hope it helps

Dimmer Buzzing
If you hook up a really cheap dimmer switch, you may notice a strange buzzing noise. This comes from vibrations in the bulb filament caused by the chopped-up current coming from the triac.
If you've read How Electromagnets Work, you know that electricity flowing through a coiled length of wire generates a substantial magnetic field, and fluctuating current generates a fluctuating magnetic field. If you've read How Light Bulbs Work, you know that the filament at the heart of a light bulb is just a coiled length of wire. It makes sense, then, that this coiled filament becomes magnetic whenever you pass current through it, and the magnetic field fluctuates with the AC current.

Normal undulating AC current fluctuates gradually, so the magnetic field does, too. The chopped-up current from a dimmer switch, on the other hand, jumps in voltage suddenly whenever the triac becomes conductive. This sudden shift in voltage changes the magnetic field abruptly, which can cause the filament to vibrate -- it's rapidly drawn to and repelled by the metal arms holding it in place. In addition to producing a soft buzzing sound, the abruptly shifting magnetic field will generate weak radio signals that can cause interference on nearby TVs or radios!

Better dimmer switches have extra components to squelch the buzzing effect. Typically, the dimmer circuit includes an inductor choke, a length of wire wrapped around an iron core, and an additional interference capacitor. Both devices can temporarily store electrical charge and release it later. This "extra current" works to smooth out the sharp voltage jumps caused by the triac-switching to reduce buzzing and radio interference
 

·
Geocacher!!!!!!!!!!
Joined
·
2,730 Posts
Discussion Starter · #4 ·
So, outside from the buzzing sound ther is no problem or danger of failure right?
 

·
U-Joints Fear Me
Joined
·
3,361 Posts
Only reason it would fail is if you have more wattage than the dimmer is rated for. Being a cheap dimmer ts probably rated for 600 watts or less. So if you have more than that on it it will cook pretty quick.
 

·
Geocacher!!!!!!!!!!
Joined
·
2,730 Posts
Discussion Starter · #8 ·
Only reason it would fail is if you have more wattage than the dimmer is rated for. Being a cheap dimmer ts probably rated for 600 watts or less. So if you have more than that on it it will cook pretty quick.
Using 5-60watt bulbs
 
1 - 9 of 9 Posts
Top