My_Ref Fremen Edition RC - Build thread - Page 88 - diyAudio
Go Back   Home > Forums > Amplifiers > Chip Amps

Chip Amps Amplifiers based on integrated circuits

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 26th December 2012, 01:55 AM   #871
diyAudio Member
 
lehmanhill's Avatar
 
Join Date: Jan 2008
Location: Chelsea, Michigan
Default Still off topic

Thanks Bob,

I didn't see the first screen you mentioned, but this is an attempt to attach something. I think it worked. Thanks.

As for your article, yes, it is essentially the idea. I'm using an accelerometer instead of dual voice coils. The advantage is that a bass speaker has a lot of distortion due to mass and suspension effects. A feedback subwoofer reduces the distortion significantly, sometimes by as much as 10 or 15 dB. Essentially, the feedback system measures the difference between the input signal and where the speaker coil moved. The power amp forces the speaker to move where it is supposed to be. The result is cleaner bass.

My father built one in the mid-80's and published an article in Speaker Builder, although companies like Velodyne sold very similar subwoofers before that. If my current project works, I'll have to do a forum project on the subject.
Attached Images
File Type: jpg subwoofer board.jpg (244.1 KB, 180 views)
  Reply With Quote
Old 26th December 2012, 02:01 AM   #872
bcmbob is offline bcmbob  United States
diyAudio Member
 
Join Date: Dec 2009
Location: Bay City, Michigan
Worked great. Very clear and quite impressive. You may be organizing another group buy in your near future.

That first screen doesn't show till you select "Advanced Mode" near the bottom of the page.
Attached Images
File Type: jpg Capture3.JPG (85.0 KB, 173 views)
__________________
Bob M.
"Arrange Whatever Pieces Come Your Way."

Last edited by bcmbob; 26th December 2012 at 02:06 AM.
  Reply With Quote
Old 26th December 2012, 10:28 PM   #873
Reality first!
diyAudio Member
 
ClaveFremen's Avatar
 
Join Date: May 2005
Location: Milan, Italy
Quote:
Originally Posted by lehmanhill View Post
I've been busy designing an upgraded signal board for my feedback subwoofer. I took suggestions from on components from Dario, gleaned pearls of wisdom from Dario, Andrew, and Tom, and studied the FE RC and other designs to come up with a board design. It just arrived as if a Christmas present.
Wow Jac!

Really nice!
__________________
Dario
ClaveFremen "Bailando Salsa en el Sietch"
  Reply With Quote
Old 27th December 2012, 02:25 PM   #874
diyAudio Member
 
lehmanhill's Avatar
 
Join Date: Jan 2008
Location: Chelsea, Michigan
Dario,

Thanks and thanks for your suggestions. I really did learn a lot from the FE and put those ideas into this board.

Jac
  Reply With Quote
Old 27th December 2012, 06:28 PM   #875
Reality first!
diyAudio Member
 
ClaveFremen's Avatar
 
Join Date: May 2005
Location: Milan, Italy
Quote:
Originally Posted by lehmanhill View Post
Thanks and thanks for your suggestions. I really did learn a lot from the FE and put those ideas into this board.
You're welcome
__________________
Dario
ClaveFremen "Bailando Salsa en el Sietch"
  Reply With Quote
Old 28th December 2012, 02:46 PM   #876
diyAudio Member
 
lehmanhill's Avatar
 
Join Date: Jan 2008
Location: Chelsea, Michigan
Question A little off topic

Has anyone ever tried to solder a component lead that doesn't want to wet with solder? If so, what can you do to correct this? I am updating some small capacitors in my subwoofer amplifier with some styrene capacitors and the solder won't stick to the leads. The parts come from Parts Connexion, so they should be reputable parts.

Jac
  Reply With Quote
Old 28th December 2012, 03:32 PM   #877
bcmbob is offline bcmbob  United States
diyAudio Member
 
Join Date: Dec 2009
Location: Bay City, Michigan
Have you scraped the lead with a razor or exacto blade. I have a very small file and emery paper right next to the solder station. Radio shack was notorious for that problem. Maybe just shoot off a message to the seller.
__________________
Bob M.
"Arrange Whatever Pieces Come Your Way."
  Reply With Quote
Old 28th December 2012, 04:04 PM   #878
diyAudio Member
 
lehmanhill's Avatar
 
Join Date: Jan 2008
Location: Chelsea, Michigan
Thanks Bob,

I had not run into that problem before. I had thought of trying to file it, but these are really thin, really flexible leads and I couldn't get it to stay still. The emery paper did the trick. Thanks again.

Jac
  Reply With Quote
Old 28th December 2012, 04:07 PM   #879
bcmbob is offline bcmbob  United States
diyAudio Member
 
Join Date: Dec 2009
Location: Bay City, Michigan
__________________
Bob M.
"Arrange Whatever Pieces Come Your Way."
  Reply With Quote
Old 29th December 2012, 10:25 AM   #880
grigore is offline grigore  Romania
diyAudio Member
 
grigore's Avatar
 
Join Date: Sep 2005
Location: Romania
Send a message via Yahoo to grigore
Helo Clave!
Did you compared the two amplifiers, yours against the Penasa?
I have found the Penasa amplifier very good sounding but the sound is a bit dry comparing to other solid states desings.
Any thoughts form you in this matter is highly appreciated!
Thanks!
__________________
Today is better!
  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
My_Ref Fremen Edition - Beta build/Fine tuning ClaveFremen Chip Amps 1523 1st December 2013 12:16 PM
My_Ref Fremen Edition - need help on PCB evaluation ClaveFremen Chip Amps 450 23rd October 2013 04:38 PM
Last My_Ref Fremen Edition RC boards for sale ClaveFremen Swap Meet 3 4th December 2012 02:04 PM
Hx-Home Edition and Hx Mini Edition will be released December, 24th destroyer X Solid State 54 3rd September 2012 04:44 PM
Canton ERGO RC-1 (frequency room compensation) for RC-L - Schematic wanted tiefbassuebertr Multi-Way 2 20th September 2010 12:20 PM


New To Site? Need Help?

All times are GMT. The time now is 11:36 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