SEWA - Seven Watt Amplifier - Page 5 - 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 16th February 2006, 07:24 AM   #41
Mad_K is offline Mad_K  Norway
diyAudio Member
 
Mad_K's Avatar
 
Join Date: Sep 2002
Location: Norway
When designs are getting this many parts, it's a real aid to have a good pcb. I have designed a pcb that is really easy to make for yourself. It measures 33x100mm, single sided, and features only industry standard parts which should be easy to get in most parts of the world.
Attached Files
File Type: pdf sewar1.diy.pdf (21.6 KB, 1213 views)
__________________
Mads K
  Reply With Quote
Old 16th February 2006, 08:06 AM   #42
Mad_K is offline Mad_K  Norway
diyAudio Member
 
Mad_K's Avatar
 
Join Date: Sep 2002
Location: Norway
Assembly drawing for PCB
Attached Files
File Type: pdf sewar1.***.pdf (35.1 KB, 919 views)
__________________
Mads K
  Reply With Quote
Old 16th February 2006, 08:07 AM   #43
Mad_K is offline Mad_K  Norway
diyAudio Member
 
Mad_K's Avatar
 
Join Date: Sep 2002
Location: Norway
Bill of Materials
Attached Files
File Type: pdf sewar1.bom.pdf (50.5 KB, 750 views)
__________________
Mads K
  Reply With Quote
Old 16th February 2006, 08:09 AM   #44
Mad_K is offline Mad_K  Norway
diyAudio Member
 
Mad_K's Avatar
 
Join Date: Sep 2002
Location: Norway
Drill plan
Attached Files
File Type: pdf sewar1.drl.pdf (29.7 KB, 577 views)
__________________
Mads K
  Reply With Quote
Old 16th February 2006, 08:13 AM   #45
Mad_K is offline Mad_K  Norway
diyAudio Member
 
Mad_K's Avatar
 
Join Date: Sep 2002
Location: Norway
Here is the PSU schematic
Attached Files
File Type: pdf sewa+ota3,5 psu.pdf (64.8 KB, 1104 views)
__________________
Mads K
  Reply With Quote
Old 16th February 2006, 11:05 AM   #46
diyAudio Member
 
JRKO's Avatar
 
Join Date: Dec 2003
Location: U.K.
Send a message via AIM to JRKO
I cant seem to download the last .pdf. Is it just me? I see 15 others have managed
__________________
If I'm not making noise, I'm making something to make noise
  Reply With Quote
Old 16th February 2006, 11:12 AM   #47
Mad_K is offline Mad_K  Norway
diyAudio Member
 
Mad_K's Avatar
 
Join Date: Sep 2002
Location: Norway
worked for me..
__________________
Mads K
  Reply With Quote
Old 16th February 2006, 11:06 PM   #48
lineup is offline lineup  Sweden
diyAudio Member
 
lineup's Avatar
 
Join Date: Dec 2005
Location: the north
Quote:
Originally posted by JRKO
I cant seem to download the last .pdf. Is it just me? I see 15 others have managed
psu.pdf

It is possible to download.
But when opened there is an error and it does not display correctly.

Error message:
Unknown token 'b*9.89' was found.


You better make a new version.
__________________
lineup
  Reply With Quote
Old 16th February 2006, 11:21 PM   #49
Mad_K is offline Mad_K  Norway
diyAudio Member
 
Mad_K's Avatar
 
Join Date: Sep 2002
Location: Norway
Here'a e fresh one
Attached Files
File Type: pdf sewa+ota3,5 psu.pdf (63.7 KB, 748 views)
__________________
Mads K
  Reply With Quote
Old 16th February 2006, 11:36 PM   #50
lineup is offline lineup  Sweden
diyAudio Member
 
lineup's Avatar
 
Join Date: Dec 2005
Location: the north
that was better
---------------------------------

If there is one thing I should change in SEWA rev1
is the bias resistor for MOSFET.
Now R2 is VERY HIGH, 330kOhm.

I would more like to have it 33k.
This of course means increase C2 input cap to 1uF, to get same bass rolloff.

Otherwise I have not anything to complain about.
Your SEWA circuit is a very nice amplifer.
__________________
lineup
  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
Tube Pre Amplifier for SEWA 7 Watt ClassA MOSFET lineup Tubes / Valves 278 2nd June 2009 05:44 PM


New To Site? Need Help?

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