X-Amp (LME49830 + Exicon Lateral Mosfets) - 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 8th June 2010, 12:40 AM   #1
diyAudio Member
 
danfo098's Avatar
 
Join Date: Apr 2005
Location: Linköping
Default X-Amp (LME49830 + Exicon Lateral Mosfets)

Hello forum, it's been a while...

I just wanted to share my latest project with you.

It's a LME49830 based amplifier with Exicon lateral mosfets as output devices.

The schematic:
http://www.diyprojects.se/X-Amp/X-Amp.pdf

The BOM:
http://www.diyprojects.se/X-Amp/X-Amp_BOM.pdf

And the layout in its current state:
Click the image to open in full size.

All comments are welcome.
  Reply With Quote
Old 8th June 2010, 02:46 AM   #2
diyAudio Member
 
panson_hk's Avatar
 
Join Date: Aug 2005
Blog Entries: 10
Nice! Is it a two-layer board? High-current path is so close to the input jack. Will it be a problem?

You don't need G-S voltage clamp protection?

Last edited by panson_hk; 8th June 2010 at 02:49 AM.
  Reply With Quote
Old 8th June 2010, 11:49 AM   #3
diyAudio Member
 
danfo098's Avatar
 
Join Date: Apr 2005
Location: Linköping
Hi panson and thank you.

I haven't done any routing yet and haven't decided on how many layers it will be but it will be four or six layers. I want complete layers for GND, V+ and V- and if I can do the routing on one side I'll go with four otherwise six.

I'll try to squeeze the psu connectors as close together to the right as possible later. It might be a problem but hopefully not.

Why is the G-S overvoltage protection not needed, I mean isn't it always good practise to use them.
And what about esd protection for when "fiddling" with the amp?

Last edited by danfo098; 8th June 2010 at 11:52 AM.
  Reply With Quote
Old 8th June 2010, 12:00 PM   #4
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
2layer PCB is sufficient.
Ground Planes and Power Planes are not required for audio signals.
__________________
regards Andrew T.
  Reply With Quote
Old 8th June 2010, 01:26 PM   #5
diyAudio Member
 
Join Date: Jun 2004
Location: the Netherlands
Quote:
Originally Posted by AndrewT View Post
2layer PCB is sufficient.
Ground Planes and Power Planes are not required for audio signals.
Dear Andrew,

I tend to agree with you, but my vision about this has changed since last saturday, when I followed one of the most interesting AES audio courses in a long time. Given by Mr. Bruno Putzey (Hypex) and Mr. Guido Tent (Tentlabs).

And they where totally disagree with star grounding. Their vision is, even for low bandwidth audio signal's one should think RF. We learned in this course that ground-planes don't have to be bad at all, you just must know how to design them. Thinking in current circles and loops, and carefully place components. Basically the same way of thinking when you design star-grounds, however star grounds are more forgiving.

The idea of star-ground is more a left over from old ways of thinking, and ground-planes do scare the hell out of some people (it also fear them ) But once good implemented I believe that ground-planes must be superior also for audio. For any audio designer, I think it is really worth it to invest a lot of time in this to master it.

I've seen them successfully implemented here by forum members (I remember a BPA300 design). Jeff Rowland does it successfully. Just to mention some examples.

With kind regards,
Bas

Last edited by Sebastiaan; 8th June 2010 at 01:31 PM.
  Reply With Quote
Old 14th May 2011, 11:33 PM   #6
diyAudio Member
 
danfo098's Avatar
 
Join Date: Apr 2005
Location: Linköping
Red squadron...
Attached Images
File Type: jpg DSC_0004_.JPG (244.9 KB, 1902 views)
File Type: jpg DSC_0008_.JPG (169.5 KB, 1739 views)
File Type: jpg DSC_0024_.JPG (148.8 KB, 1700 views)
File Type: jpg DSC_0032_.JPG (118.7 KB, 1673 views)
File Type: jpg DSC_0040_.JPG (175.1 KB, 564 views)
  Reply With Quote
Old 14th May 2011, 11:49 PM   #7
riktw is offline riktw  Netherlands
diyAudio Member
 
Join Date: Sep 2007
holycow they look awesome
is it possible to buy 2 PCB's?
  Reply With Quote
Old 15th May 2011, 12:29 AM   #8
diyAudio Member
 
danfo098's Avatar
 
Join Date: Apr 2005
Location: Linköping
Hi riktw,

I have 10 PCB's right now but unfortunately all are claimed for (2 by me). I haven't assembled and tested the design yet so I don't even know if it works yet, however I don't see any reasons why it shouldn't.

Another thing is that the PCB's are quite expensive, 50 USD per PCB. It's a 2.4mm thick 6 layer design with 70um copper on all layers and gold plating.

When I have assembled and tested the amp I'll get back with the results, waiting for components right now.

If more forum members are interested I'll order another batch of PCB's and sell them but I at least want to test it first.
  Reply With Quote
Old 16th May 2011, 10:06 AM   #9
diyAudio Member
 
Join Date: Mar 2001
Location: Brazil
Great design. Congratulations!

Pity you didn't implement any DC servo for it, or DC protection.

Perhaps something like this might be used:

Untitled Document

I found this quite recently and thought it to be a clever idea.

If you add an input switch and an LDR attenuator at the input, you would have a very high quality integrated amp.

Are there any US sources for the MOSFETs?


Carlos

Last edited by carlmart; 16th May 2011 at 10:11 AM.
  Reply With Quote
Old 16th May 2011, 11:40 AM   #10
diyAudio Member
 
danfo098's Avatar
 
Join Date: Apr 2005
Location: Linköping
Hi Carlos and thank you.

Actually I'm working on a DC-offset protection board and
also a soft start board which I will use for this project. However there will
be no DC servo.

Input switch and attenuator will be a separate preamplifier project. Didn't know about the LDR attenuator it looks interesting.

I don't know if there are any US sources for the MOSFETs maybe some other forum member know?
  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
Counterpoint SA-100 with Exicon MOSFETs woodman Solid State 28 23rd March 2014 02:25 PM
2A ClassA using EXICON Lateral lineup Solid State 4 31st January 2009 11:32 PM
How do the pinouts on Exicon mosfets work? reiver Solid State 4 11th October 2008 01:27 AM
Lateral mosfets - why ? Stormo Solid State 5 2nd July 2003 07:14 AM
exicon mosfets STUART Solid State 8 23rd November 2001 09:30 PM


New To Site? Need Help?

All times are GMT. The time now is 03:57 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