Mosfet A40 - Page 3 - diyAudio
Go Back   Home > Forums > Amplifiers > Pass Labs

Pass Labs This forum is dedicated to Pass Labs discussion.

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 7th April 2005, 02:31 AM   #21
jam is offline jam  United States
diyAudio Member
 
jam's Avatar
 
Join Date: May 2001
Location: Auburn, CA, USA
Mike,

It's about time...................we need pics...........time to spring for a digital camera.

Jam
  Reply With Quote
Old 23rd April 2005, 02:41 PM   #22
MikeW is offline MikeW  United States
diyAudio Member
 
MikeW's Avatar
 
Join Date: Sep 2002
Location: North of Boston
Default Pictures

I can't get the pictures the correct size. Jam post the ones you have along with your review.
__________________
MikeW
  Reply With Quote
Old 24th April 2005, 06:15 PM   #23
diyAudio Member
 
jacco vermeulen's Avatar
 
Join Date: Oct 2004
Location: At the sea front, Rotterdam or Curaçao
Send a message via Yahoo to jacco vermeulen
I just received the IRFP power Mosfets and some other components from Tarasque who offered to bring them from Germany.
Hoping to get both assembled within a week or two.
The circuit i've got does not contain RC values for frequency compensation, only question marks.
Did you choose values already, Mike ?
__________________
The buck stops Here
  Reply With Quote
Old 24th April 2005, 10:28 PM   #24
jam is offline jam  United States
diyAudio Member
 
jam's Avatar
 
Join Date: May 2001
Location: Auburn, CA, USA
Jacco,

When I designed the amplifier I added places for compensation capacitors in case of instability...............but as Mike has found out the amplifier seems to work fine without them.

The amp sounds pretty good..........but then I am biased.........the higher the bias the better it sounds, as long as you have enough heatsinking and don't go crazy.

I would like to thank Mr.Pass for his help and inspiration.

Some pictures of the prototype.
Attached Images
File Type: jpg b1_660.jpg (41.2 KB, 1496 views)
  Reply With Quote
Old 24th April 2005, 10:29 PM   #25
jam is offline jam  United States
diyAudio Member
 
jam's Avatar
 
Join Date: May 2001
Location: Auburn, CA, USA
......
Attached Images
File Type: jpg b2_290.jpg (45.6 KB, 1323 views)
  Reply With Quote
Old 24th April 2005, 10:31 PM   #26
jam is offline jam  United States
diyAudio Member
 
jam's Avatar
 
Join Date: May 2001
Location: Auburn, CA, USA
.....and...........happy now Mike.

Regards,
Jam
Attached Images
File Type: jpg c1_928.jpg (48.1 KB, 1169 views)
  Reply With Quote
Old 24th April 2005, 11:52 PM   #27
MikeW is offline MikeW  United States
diyAudio Member
 
MikeW's Avatar
 
Join Date: Sep 2002
Location: North of Boston
Default Happy

I will be happy when.... You find those P-channel MOSFETS, the Donzi is back in the water, and I get to the Buffet after six weeks at home.
Thanks, Jam and Nelson.
__________________
MikeW
  Reply With Quote
Old 24th November 2005, 05:14 PM   #28
diyAudio Member
 
jacco vermeulen's Avatar
 
Join Date: Oct 2004
Location: At the sea front, Rotterdam or Curaçao
Send a message via Yahoo to jacco vermeulen
I'll be posting pictures of my MA-40s shortly.
(waiting for binding posts from jrsun and aluminium oxide insulators from Mark G to arrive in the mail)

Just wanted to say thank you to both of you: Jam for designing and Mike for sending me the boards.
For some reason these were the nicest boards to solder that i've ever done.
I've been using WBT silver solder for a long time, soldering the boards was a treat.
Thanks.
__________________
The buck stops Here
  Reply With Quote
Old 27th November 2005, 08:16 PM   #29
diyAudio Member
 
jacco vermeulen's Avatar
 
Join Date: Oct 2004
Location: At the sea front, Rotterdam or Curaçao
Send a message via Yahoo to jacco vermeulen
My soldering job:
Attached Images
File Type: jpg ma-40-board.jpg (95.5 KB, 957 views)
__________________
The buck stops Here
  Reply With Quote
Old 27th November 2005, 08:21 PM   #30
diyAudio Member
 
jacco vermeulen's Avatar
 
Join Date: Oct 2004
Location: At the sea front, Rotterdam or Curaçao
Send a message via Yahoo to jacco vermeulen
How its going on the sinks, the capacitor board comes underneith.
The 30VA and 300VA toroid transformers and the voltage board go in an enclosed and shielded bottom section made from 0.4" aluminium covered with copper foil.
Attached Images
File Type: jpg ma-40-heatsink.jpg (92.2 KB, 990 views)
__________________
The buck stops Here
  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
BiCMOS Bipolar+MOSFET better than MOSFET lineup Solid State 5 8th December 2009 12:46 PM
New mosfet amp from ESP B.VDBOS Solid State 139 2nd July 2004 04:18 AM
MOSFET/MOSFET amplifier jarek Pass Labs 21 22nd June 2004 06:04 PM
The best Mosfet for the ZOZ ? ralf Pass Labs 6 9th January 2002 06:41 PM


New To Site? Need Help?

All times are GMT. The time now is 10:44 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