Toroidals as OPTs? - Page 3 - diyAudio
Go Back   Home > Forums > Amplifiers > Tubes / Valves

Tubes / Valves All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum

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 24th August 2004, 01:33 PM   #21
jlsem is offline jlsem  United States
diyAudio Member
 
jlsem's Avatar
 
Join Date: Jun 2003
Location: Dallas,TX
Quote:
gapped toroid? wheres the gap?
After the tape is wound, the impregnated core is cut across the diameter. Of course the hard part is setting the gap correctly BEFORE the transformer is wound.

John
  Reply With Quote
Old 24th August 2004, 05:26 PM   #22
diyAudio Member
 
smoking-amp's Avatar
 
Join Date: Dec 2001
Location: Hickory, NC
Default distributed gap toroids

There is another way to get an effective magnetic gap by co-winding the M6 material with a mylar strip film. This is usually done for mass produced cores since the "gap" cannot be adjusted afterwards, but is more mechically stable over time than cut gaps, and simplifies matters for automatic winding equipment. (Since it is a bad idea to wind near any cut gap, very high copper losses near any gap - eddy currents induced in the copper , to the point of overheating and insulation failure in a power core.) But your winder may be able to find a catalog distributed gap core with a reasonable characteristic.

The magnetic flux does have to actually cross the interface between M6 layers to make a loop, it doesn't just spiral out along the sheet. Normal cores are tightly wound M6 strip for this reason, usually spot welded at the outer end to hold them tight or baked with some epoxy binder. So if you should ever want to remove some core material on a DIY project, remove M6 from the inside of the toroid if it has a spot weld on the outside, so it stays tight. The reason the usual toroids act gapless is because of the large area available to cross layers and tight fit. Sort of like Ohms law for resistors; the gap width, or 1/(tightness of wind) in this case, is series resistance, the larger gap area is like paralleling resistors.
__________________
I want a Huvr-Board!!
  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
toroidals Professor smith Swap Meet 0 30th November 2008 10:50 PM
Toroidals for LM3875 Nordic Chip Amps 12 20th September 2005 05:53 PM
Dual Toroidals???? bowdown Solid State 3 31st December 2004 09:25 AM
0-42 0-42, 1500VA Toroidals richie00boy Group Buys 10 23rd November 2004 11:24 PM


New To Site? Need Help?

All times are GMT. The time now is 10:25 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