Eddy Currents - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

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 13th May 2006, 07:29 PM   #1
jsa_ind is offline jsa_ind  United States
diyAudio Member
 
Join Date: May 2005
Location: Orlando
Default Eddy Currents

Is it true that having metal parts near electronic circuits would generate Eddy Currents ?

If so would Eddy Currents be generated when a Aluminum Heat Sink is used on a Power Transistor block ?

Please help me understand this concept !

Thanks,

jsa_ind
  Reply With Quote
Old 13th May 2006, 09:54 PM   #2
MikeB is offline MikeB  Germany
diyAudio Member
 
MikeB's Avatar
 
Join Date: Apr 2004
Location: GŁtersloh
Eddy currents are generated by magnetic induction inside metal, you need a changing or pulsating magnetic field to get them. As in a normal amplifier magnetic fields are minimal the answer to your 2nd question is NO.
You might get eddy currents if metal is close to the output inductor, but still they are too small to have any effect.

Mike
  Reply With Quote
Old 13th May 2006, 11:52 PM   #3
ilimzn is offline ilimzn  Croatia
diyAudio Member
 
Join Date: Feb 2005
Location: Zagreb
...at and well above audio frequencies. Eddy currents can be a problem elsewhere (for instance when air core or air gapped inductors are used - like in class D output filters - or at (V)HF) but normally in an audio amp, it's not a problem. One exception is induction from a stray field of a transformer in proximity with the circuit, but _eddy_ surrents would be far less of a problem then actual induced voltages across various circuit parts.
  Reply With Quote
Old 14th May 2006, 10:05 AM   #4
MikeB is offline MikeB  Germany
diyAudio Member
 
MikeB's Avatar
 
Join Date: Apr 2004
Location: GŁtersloh
Maybe a bit OT, but very interesting to see how destructive eddy curents can be...

http://members.tripod.com/extreme_skier/cancrusher/

Look at the Joule numbers used !

Mike
  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
D1 bias currents spzzzzkt Pass Labs 2 26th June 2008 02:45 AM
Eddy current damping dqswim Everything Else 3 28th April 2005 03:03 PM
The 'Interface' - Steve Eddy? shuang Everything Else 107 30th December 2003 03:35 PM


New To Site? Need Help?

All times are GMT. The time now is 12:26 AM.


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