Go Back   Home > Forums > Loudspeakers > Planars & Exotics

Planars & Exotics ESL's, planars, and alternative technologies

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 March 2013, 08:59 AM   #211
Account disabled at member's request
 
Join Date: Sep 2007
Location: Multiple...
Quote:
Originally Posted by solhaga View Post
The difference between the N:s is the square root of the division if I remember it correctly.
So N52 is 1,22 times stronger than N35. But you must analyze every circuit as there can be saturation (for iron it is 2T) that minimizes the fields.
What field strength do you get with 6 mm and 10 mm iron and N52 ?

The interesting issues are:
1. How much iron are needed if N52 are used ?
2. How weak magnets can be used for a given iron to get maximum field strength ?
  Reply With Quote
Old 13th March 2013, 09:08 AM   #212
solhaga is offline solhaga  Sweden
diyAudio Member
 
Join Date: Jun 2009
Location: Värsta Götaland
I guess you are asking me to do the analysis.
Have you tried to use FEMM yourself?

To avoid cluttering this thread, perhaps I can mail you? I´ve sent you a PM.
Also uploading pictures to the forum takes time, so a mail conversation is better.
Maybe the end result can be posted here.

Last edited by solhaga; 13th March 2013 at 09:10 AM.
  Reply With Quote
Old 15th March 2013, 04:45 PM   #213
diyAudio Member
 
Join Date: Dec 2008
I have made a "Kithara" model:
[IMG]Click the image to open in full size.[/IMG]
[IMG]Click the image to open in full size.[/IMG]
I have used my 6x10x70mm neodynium magnets,and tried with a 4mm thick diaphragm.
Sensivity is much higher,but I hane not made any measurements yet.
I am waiting for my new magnets to arive.

Bernt
  Reply With Quote
Old 15th March 2013, 07:59 PM   #214
solhaga is offline solhaga  Sweden
diyAudio Member
 
Join Date: Jun 2009
Location: Värsta Götaland
Looking great!
  Reply With Quote
Old 17th March 2013, 12:23 PM   #215
solhaga is offline solhaga  Sweden
diyAudio Member
 
Join Date: Jun 2009
Location: Värsta Götaland
@båndsei: I sent you a PM.
  Reply With Quote
Old 18th March 2013, 08:05 PM   #216
diyAudio Member
 
Join Date: Dec 2008
I got my magnets from Polen.
[IMG]Click the image to open in full size.[/IMG]
I have tested the new magnetsystem with the 7,5mm thick magnets and 5mm.thick diaphragm.
It does not seem to improve the performances regarding THD and FR.
I have to make more measurements to be sure.

Bernt.
  Reply With Quote
Old 19th March 2013, 04:25 AM   #217
solhaga is offline solhaga  Sweden
diyAudio Member
 
Join Date: Jun 2009
Location: Värsta Götaland
Did you get higher excursion?
  Reply With Quote
Old 19th March 2013, 04:30 PM   #218
diyAudio Member
 
Join Date: Dec 2008
It is not posibly to see any motion of the diaphragm course of the magnetsystem.

Bernt
  Reply With Quote
Old 19th March 2013, 04:59 PM   #219
Account disabled at member's request
 
Join Date: Sep 2007
Location: Multiple...
Quote:
Originally Posted by båndsei View Post
It is not posibly to see any motion of the diaphragm course of the magnetsystem.

Bernt
I tested a Mark & Daniel AMT with a 1.5 volt battery and I cannot see any movement even if I used a 10x magnifying lens..
The Mark & Daniel AMT have ca. 700Hz lower bandwidth and ca. 89dB sensitivity.

With my AMTs the lower (-3dB SPL) bandwidth are ca. 100Hz (due to limited diaphragm area), but are designed for DC operation...
So there I can se the movement of the diaphragm with the naked eye as 1.5 volt moves the diaphragm ca. half xmax, and as every second fold / pleat moves in opposite direction the movement are then very easy to see..
  Reply With Quote
Old 20th March 2013, 06:06 AM   #220
solhaga is offline solhaga  Sweden
diyAudio Member
 
Join Date: Jun 2009
Location: Värsta Götaland
Perhaps it is the pleat folds themselves.
If a foldering "machine" with thinner plates where used, much sharper edges would be the result.
Shouldn´t it result in better compliance and also a more V-shaped folds of the diaphragm rather than U-shaped with your current method?
And as such compressing/decompressing the air better giving a higher SPL?
  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
AMT diaphragm DIY basics. graeme uk Planars & Exotics 2 9th December 2010 09:17 PM
DIY AMT: which of the three replacement diaphragms to use? capslock Planars & Exotics 3 4th July 2010 05:26 PM
big AMT Diy Charcoal Planars & Exotics 27 13th October 2008 06:41 AM
Diy Amt ? woody Planars & Exotics 0 24th September 2005 11:17 AM
Diy Amt JohnL Planars & Exotics 4 29th April 2005 03:16 PM


New To Site? Need Help?

All times are GMT. The time now is 11:22 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