Image Request: AMT / Heil diaphragm. - 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 14th April 2011, 08:20 PM   #1
diyAudio Member
 
Join Date: Oct 2001
Location: London, England
Default Image Request: AMT / Heil diaphragm.

Hi All

As per the title above, I was wondering if anyone had a picture of an un-folded AMT diaphragm. I'm in the middle of bodging together a small clone or three to fill my evenings and want to keep the whole project under 60GBP so replacement diaphragms are out.

So far I've spent:
25GBP on mild steel.
30GBP on magnets.
10GBP on various thicknesses of Mylar/PET
0GBP on alu foil from the kitchen.

Ideally i'd also like to know the overall dimensions and the number and depth of the pleats so I know how much density to achieve in MY folded element. I'm also nosey for just what they look like!
I've had a rough attempt working but think that I need more pleats so need to narrow pleat width and increase the number, parallelling some of them, as Re was already high.

I've searched all over the net and there are no pics that I can find, surely someone took a pic or two when they pulled out a duff element for replacement.

Pics of everything WILL follow but not till I'm finished and they work.

Cheers

Nick.
__________________
Real Engineers do it on a budget.....

Last edited by Grumpy_Git; 14th April 2011 at 08:21 PM. Reason: dumbness
  Reply With Quote
Old 15th April 2011, 12:28 AM   #2
diyAudio Member
 
bolserst's Avatar
 
Join Date: Jun 2005
Location: Fort Worth, Texas
Quote:
Originally Posted by Grumpy_Git View Post
I was wondering if anyone had a picture of an un-folded AMT diaphragm.
You might check out the DIY AMT article posted here:
Hornloading the Heil AMT1

There is a picture of an unfolded diaphragm on page 22.
  Reply With Quote
Old 15th April 2011, 08:42 AM   #3
diyAudio Member
 
Join Date: Oct 2001
Location: London, England
Quote:
Originally Posted by bolserst View Post
There is a picture of an unfolded diaphragm on page 22.
Thanks for the heads up but I had already seen that and I have the original Neil Davis/AA article (I have been searching), I was hoping for one of the OEM diaphragms, I shall keep looking.

Nick.
__________________
Real Engineers do it on a budget.....
  Reply With Quote
Old 15th April 2011, 06:40 PM   #4
Baldin is online now Baldin  Denmark
diyAudio Member
 
Baldin's Avatar
 
Join Date: Jan 2005
Location: Copenhagen
Send a message via MSN to Baldin
I'll mail some files for you, if you provide an address which will accept a 2 Mbyte file
__________________
Visit www.sensibleaudio.dk or read latest news on Baldin's Blog

Last edited by Baldin; 15th April 2011 at 06:43 PM.
  Reply With Quote
Old 21st April 2011, 10:30 AM   #5
diyAudio Member
 
Join Date: Oct 2001
Location: London, England
Baldin

Thank you for the offer, you could try:

Nick at kowal1 dot fsnet dot uk

replacing the at for @ and dot for . as required.

Nick.
__________________
Real Engineers do it on a budget.....
  Reply With Quote
Old 21st April 2011, 03:13 PM   #6
Baldin is online now Baldin  Denmark
diyAudio Member
 
Baldin's Avatar
 
Join Date: Jan 2005
Location: Copenhagen
Send a message via MSN to Baldin
Should be in your inbox
/Baldin
__________________
Visit www.sensibleaudio.dk or read latest news on Baldin's Blog
  Reply With Quote
Old 23rd April 2011, 02:25 PM   #7
diyAudio Member
 
Join Date: Oct 2001
Location: London, England
Baldin

I've just re-checked this thread and realised the email address I put up was wrong, my apologies, 800mile road trips tend to make me overly tired.

would you mind re-sending the email but to:
nick at kowal1 dot fsnet dot co dot uk

Sorry for wasting your time and thanks again.

Nick.
__________________
Real Engineers do it on a budget.....
  Reply With Quote
Old 2nd May 2011, 06:21 PM   #8
diyAudio Member
 
Join Date: Oct 2001
Location: London, England
Two items in this post.

First: Thanks to Baldon for his email.

Secondly: I've completed the first of the tweeters and it seems to be working nicely when i just run it instead of the tweeter in my main system so progress continues on the other two (I want them all across the fronts of my main system) I will try and get some freq responses done next week.

Now the reason for my post. I had to sell all my spare drivers some time ago and I would like to build a nice low/mid section to match these tweeters.

I was thinking cheap transmission lines, and the cheapest drivers I've seen recently that appeal are the Eminence Alpha 8A. does anyone have an opinion on these before I buy them or download the MJK worksheets. Basically I want a low cost TL and I dont really want full range, so fostex are out, some suggestions of completed projects would be nice as time and cash are limited right now.

Thanks

Nick.

PS: cant seem to upload photos or create albums etc.. anyone know how to do this?

PPS: found it Click the image to open in full size.
__________________
Real Engineers do it on a budget.....

Last edited by Grumpy_Git; 2nd May 2011 at 06:44 PM. Reason: added pic
  Reply With Quote
Old 6th May 2011, 08:43 AM   #9
diyAudio Member
 
Join Date: Jun 2004
Location: X
the magnets are badly placed , only half of the stacked sheets have contact to the pole surface , a lot of flux is wasted , change the geometry for more efficiency ..
  Reply With Quote
Old 6th May 2011, 09:36 AM   #10
diyAudio Member
 
Join Date: Oct 2001
Location: London, England
Actually the magnets contact all the laminations as the openings/shorter laminations have 45 degree cuts reversed from the longer pieces so there are no gaps.


Nick.
__________________
Real Engineers do it on a budget.....
  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
ESS Heil AMT Chris Bolkan Planars & Exotics 13 24th June 2011 11:26 AM
AMT diaphragm DIY basics. graeme uk Planars & Exotics 2 9th December 2010 10:17 PM
Heil AMT Specs? Zero Cool Multi-Way 1 30th May 2007 04:13 PM
Heil AMT, any one used in new design MES Multi-Way 9 27th October 2003 02:02 AM
The Diaphragm Goddess from Heil cyclotronguy Multi-Way 1 22nd March 2002 10:55 PM


New To Site? Need Help?

All times are GMT. The time now is 03:06 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