what causes a transformer to buzz - diyAudio
Go Back   Home > Forums > Design & Build > Parts

Parts Where to get, and how to make the best bits. PCB's, caps, transformers, etc.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 19th May 2003, 05:00 PM   #1
diyAudio Member
 
Join Date: Oct 2002
Location: south amboy nj
Send a message via AIM to zx3chris
Default what causes a transformer to buzz

the wall mount ad-dc transformer for my cordless phone started buzzing today---does this mean its on its way out?? i know why flourescents and incandescants and dimmers buzz sometimes, but why a tranny???

-chris
  Reply With Quote
Old 19th May 2003, 05:10 PM   #2
RobM is offline RobM  United States
diyAudio Member
 
Join Date: May 2003
Location: West Orange, NJ, USA
Send a message via AIM to RobM
Usually because the windings are vibrating against each other.
  Reply With Quote
Old 19th May 2003, 05:13 PM   #3
diyAudio Member
 
Join Date: Oct 2002
Location: Winnipeg MB Canada
Hello ZX3Chris,

Transformers have many windings wrapped around a metal or ferrite core. During manufacturing these windings are dipped in varnish or a similiar material to stop the individual windings from buzzing/humming/ringing.

It is possible that the varnish like material is breaking down on the windings, a shorted transformer is likely in your future.

Thanks

KevinLee
  Reply With Quote
Old 19th May 2003, 06:17 PM   #4
diyAudio Member
 
Join Date: Oct 2002
Location: south amboy nj
Send a message via AIM to zx3chris
makes sense now--thank u

-chris
  Reply With Quote
Old 19th May 2003, 06:20 PM   #5
diyAudio Member
 
Join Date: Oct 2002
Location: Winnipeg MB Canada
ZX3Chris,

I have stopped buzzing in transformers by spreading some silicone on the loose windings with my finger and letting it set up for 24 hours.

This will not always work but it will work most of the time. Oh yeah, make sure it is unplugged first.

KevinLee
  Reply With Quote
Old 19th May 2003, 06:46 PM   #6
PMiczek is offline PMiczek  United States
diyAudio Member
 
Join Date: May 2003
Location: Milwaukee
Default Safety

If this is a sealed wall-wart type, and if it did not buzz before, I suggest checking for overheating before attempting any kind of fix. In other words, it could be buzzing because heat may have broken down the basic construction of the transformer, and you could be running a chance of a fire, small as it is. (wall-supplies are cheaper to replace than houses).
  Reply With Quote
Old 19th May 2003, 07:33 PM   #7
diyAudio Member
 
Join Date: Oct 2002
Location: Winnipeg MB Canada
PMiczek,

Very good point on the safety issue.

I would not suggest the above fix unless the diy-er is sure it is only loose windings not another problem.

KevinLee
  Reply With Quote
Old 19th May 2003, 08:27 PM   #8
diyAudio Retiree
 
Join Date: Oct 2002
Location: Spain or the pueblo of Los Angeles
Lightbulb The buzz on transformers......

Maybe a bee or some other flying bug crawled into the housing. As likely an explantion as some I have read here.
  Reply With Quote
Old 19th May 2003, 08:32 PM   #9
RobM is offline RobM  United States
diyAudio Member
 
Join Date: May 2003
Location: West Orange, NJ, USA
Send a message via AIM to RobM
The three reasons I can think of for a transformer to emit noise:

1) Loose windings vibrating
2) Core delamination, causing laminations to vibrate together
3) Magnetostriction in the core (the metal of the core deforming under the magnetic forces)
  Reply With Quote
Old 19th May 2003, 08:51 PM   #10
PMiczek is offline PMiczek  United States
diyAudio Member
 
Join Date: May 2003
Location: Milwaukee
Default Transformer hum

Fred,

Have any other explanations that would apply to a small wall transformer & DC converter?

PM
(I've heard "it hums because it does not know the words already")
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

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
is toroidal transformer hum,buzz dangerous?? gbolly Chip Amps 4 18th May 2009 10:57 AM
Melos triode and computer as source: BUZZ BUZZ BUZZ zigo3 Tubes / Valves 4 28th November 2007 02:11 AM
transformer hum / buzz getting into B+? cbutterworth Tubes / Valves 3 18th August 2007 01:49 AM
Oscillating transformer buzz problem, please help! Texaspledge Solid State 8 26th September 2004 10:01 PM
NAD 3020 Transformer buzz Neopsp Solid State 5 16th December 2002 09:20 AM


New To Site? Need Help?

All times are GMT. The time now is 09:17 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2