Mini planar magnetic using neos - Page 2 - diyAudio
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 January 2012, 12:55 PM   #11
diyAudio Member
 
Join Date: Jun 2002
Location: Spain
Default New membrane

Reducing the width of the aluminium strip from 5 mm to 3 mm has rised the resistance to 1.2 Ohm
Doubling the pattern on the other side of the membrane will put the resistance on 2.5 Ohm with a minimal amount of weight.
Maybe with a resistance of 2 Ohms in series this will make interesting sounds without burning any amp...

I will try to post some pics later
__________________
A cold amp is a sad amp... I like them warm at least
  Reply With Quote
Old 14th January 2012, 09:13 AM   #12
diyAudio Member
 
Join Date: Jun 2002
Location: Spain
Default the pics

Quote:
Originally Posted by karellen View Post
Reducing the width of the aluminium strip from 5 mm to 3 mm has rised the resistance to 1.2 Ohm
Doubling the pattern on the other side of the membrane will put the resistance on 2.5 Ohm with a minimal amount of weight.
Maybe with a resistance of 2 Ohms in series this will make interesting sounds without burning any amp...

I will try to post some pics later
Attached Images
File Type: jpg IMG725.jpg (780.7 KB, 411 views)
File Type: jpg IMG724.jpg (863.5 KB, 347 views)
File Type: jpg IMG726.jpg (895.8 KB, 337 views)
__________________
A cold amp is a sad amp... I like them warm at least
  Reply With Quote
Old 14th January 2012, 09:21 AM   #13
diyAudio Member
 
Join Date: Jun 2002
Location: Spain
Default The epsilon affair

Quote:
Originally Posted by JAMESBOS View Post
using this layout you won't get much sound.THE EPSILON LAYOUT IS A MUST.
I've made some calculations and the Epsilon layout is possible with the magnets availables.
also, the resistance is expected to be in the 2 Ohms region, so a doble layer will put it in a tolerable region for the amplifiers.

I expect the magnets to arrive monday or tuesday.

by that time I will try to make an epsilon membrane.

Thanks for the advise
__________________
A cold amp is a sad amp... I like them warm at least
  Reply With Quote
Old 14th January 2012, 12:46 PM   #14
diyAudio Member
 
Join Date: Jan 2007
Location: wigston leics england
I did build a A4 sized planar but it wasn't very sensitive. Then I decided to try the epsilon layout, and rebuild some of my normal designs, best thing I ever did! I did build one double layout with gaps between magnets. A 4'x 2' size using 50 x 25 x 10 ferrites. Gluing the ferrites was a bind when I moved it 25 of them came undone, not worth the effort and would be nigh impossible using neos. So I built a 60 x 40 cm one using ferrites with no gaps and it was as loud as the big one with gaps!! Then I decided to use some 50 x 12.7 x 6 mm neos which I had used for another design which wasn't very successful.I have finished the pair and they are about 5db louder than my other designs.It weighs 16lbs and is 60 x 40 cms. I will build the other one to my 4' x 2' using ferrites with the epsilon layout. You get better bass with the bigger one. The impedance of the big one is 9.6 ohms and the 60 x 40 cm one is 6.3 ohms. Use a decorating roller to run over your tape, it flattens all the bubbles etc.
__________________
HENRY
  Reply With Quote
Old 14th January 2012, 01:53 PM   #15
a.wayne is offline a.wayne  United States
Sin Bin
 
Join Date: May 2008
Location: Front Row Center
What is this epsilon layout ? do you guys have an link ?
  Reply With Quote
Old 14th January 2012, 02:58 PM   #16
diyAudio Member
 
Join Date: Jan 2007
Location: wigston leics england
Take your pick these are all based on the epsilon layout.Some have been changed to go with different magnet layouts and different sizes.All the best.
Attached Images
File Type: jpg SAM_0058.JPG (376.9 KB, 294 views)
File Type: jpg SAM_0059.JPG (462.4 KB, 274 views)
File Type: jpg SAM_0060.JPG (449.5 KB, 173 views)
File Type: jpg SAM_0062.JPG (482.0 KB, 172 views)
File Type: jpg SAM_0073.JPG (474.9 KB, 144 views)
File Type: jpg SAM_0074.JPG (413.2 KB, 150 views)
File Type: jpg SAM_0075.JPG (731.4 KB, 135 views)
File Type: jpg SAM_0076.JPG (653.5 KB, 120 views)
__________________
HENRY
  Reply With Quote
Old 14th January 2012, 03:02 PM   #17
diyAudio Member
 
Join Date: Feb 2008
Location: Jackson,michigan
My Apogee's use them same Voice Coil pattern.
Just to set the record straight.
And I thought the main Idea on the Epsilon panels was that a Rubber surround is used to support the diagphram rather than mounting it directly to the frame,

analysis epsilon

Keep up the great work guys !!

jer

Last edited by geraldfryjr; 14th January 2012 at 03:06 PM.
  Reply With Quote
Old 14th January 2012, 03:19 PM   #18
diyAudio Member
 
Join Date: Jan 2007
Location: wigston leics england
Quote:
Originally Posted by geraldfryjr View Post
My Apogee's use them same Voice Coil pattern.
Just to set the record straight.
And I thought the main Idea on the Epsilon panels was that a Rubber surround is used to support the diagphram rather than mounting it directly to the frame,

analysis epsilon

Keep up the great work guys !!

jer
I've never seen an Apogee up close to work out layout, the point of the epsilon layout was increased sensitivity by using all the magnet area. Not just the rubber surround. The big increase in sensitivity has nothing to do with the rubber surround.I suppose I could call it the epsilon apogee layout.
__________________
HENRY
  Reply With Quote
Old 14th January 2012, 03:34 PM   #19
diyAudio Member
 
Join Date: Feb 2008
Location: Jackson,michigan
Here are some closeup pictures of the Apogees and it is a little hard to tell as the end of the loops are hidden by the frame,

Apogee Speakers Construction

But, you are on the right track and the more loops that you can get in there the more efficiency you will get.
The thing that the Apogees suffer from ( besides from not using NEO's) is that there is only one loop per row of Magnets.

jer
  Reply With Quote
Old 15th January 2012, 09:45 AM   #20
diyAudio Member
 
Join Date: Jan 2007
Location: wigston leics england
Which depends on the width of your magnets or my prowess with a pair of scissors!! I myself have used 25, 19 and 12.7 mm wide magnets all can be used with the epsilon type layout. It is just a matter of working it out. Which was surprisingly easy, even for an old codger!!
__________________
HENRY
  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
help designing a magnetic planar woofer baffleman Planars & Exotics 14 18th April 2014 04:01 PM
DIY Planar magnetic Hybride WrineX Planars & Exotics 71 9th August 2012 01:48 PM
Planar magnetic with central tweeter? Few Planars & Exotics 45 29th February 2012 12:19 AM
Planar Magnetic Drivers - 8" rubicon Swap Meet 8 1st December 2010 07:22 PM
ESL vs Planar Magnetic Borat Planars & Exotics 40 8th September 2009 02:47 PM


New To Site? Need Help?

All times are GMT. The time now is 07:57 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