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 28th February 2006, 05:59 PM   #81
Mad_K is offline Mad_K  Norway
diyAudio Member
 
Mad_K's Avatar
 
Join Date: Sep 2002
Location: Norway
Are you talking about the PCB screendump i attached in post #15 in this thread?
__________________
Mads K
  Reply With Quote
Old 28th February 2006, 07:01 PM   #82
Tyimo is offline Tyimo  Hungary
diyAudio Member
 
Join Date: Nov 2002
Location: Hungary
Yes!
  Reply With Quote
Old 28th February 2006, 07:05 PM   #83
Frank40 is offline Frank40  Denmark
diyAudio Member
 
Frank40's Avatar
 
Join Date: May 2004
Location: My workshop :-)
Default one stage amp

Sorry for the late replay. I have been tryingen to make a better sch. of my amp. But my screen cap is not verry god.

So here is a link for down load of the sch.:

http://rapidshare.de/files/14371438/Cap128.jpg.html (550Kb)

If anyone is welling to helpe my, please poste the pic. So it can seen on this forum.

The amp is one stange whit voltages gain, low output imp. and no feedback. It has a real nice sound, much like a single ended tube amp.


I hope you can use it.

Regards
Frank
  Reply With Quote
Old 1st March 2006, 05:47 AM   #84
Mad_K is offline Mad_K  Norway
diyAudio Member
 
Mad_K's Avatar
 
Join Date: Sep 2002
Location: Norway
Quote:
Originally posted by Tyimo
Yes!

That one never made it, sorry. But the circuit is so simple, it can easily be done p2p. A pcb is really superflous. If you want to make the switch between OTA 3,5 Rev.0 and SEWA Rev.1 as easy as possible (and plan on using the pcb layout provided) you can simply print the layout and use it as a guide to drill the heatsink. Then do OTA3,5r0 p2p, later you can swap without having to redrill the heatsink. However, if you insist, I do have a pcb layout for OT3,5r0 that fits in the same holes, as seen on the pictures in the OTA thread
__________________
Mads K
  Reply With Quote
Old 1st March 2006, 05:50 AM   #85
Mad_K is offline Mad_K  Norway
diyAudio Member
 
Mad_K's Avatar
 
Join Date: Sep 2002
Location: Norway
Frank, I think you might get more help with that design if you make a new thread for it
__________________
Mads K
  Reply With Quote
Old 1st March 2006, 06:41 AM   #86
lineup is offline lineup  Sweden
diyAudio Member
 
lineup's Avatar
 
Join Date: Dec 2005
Location: the north
Default Re: one stage amp

Quote:
Originally posted by Frank40

I have been trying to make a better schematic of my amp.
If anyone is welling to help my, please post the pic.
So it can be seen on this forum.

The amp is one stage with voltages gain, low output imp.
No feedback.
It has a real nice sound, much like a single ended tube amp.
Here is your MOSFET amplifier.
In attachment.
I had to do some image work

Maybe you can use schematic, if you start a new topic about your amplifier.

This topic is about Mad_K amplifier SEWA.

Attached Images
File Type: png frank40_amp1.png (45.4 KB, 2220 views)
__________________
lineup
  Reply With Quote
Old 1st March 2006, 02:18 PM   #87
Tyimo is offline Tyimo  Hungary
diyAudio Member
 
Join Date: Nov 2002
Location: Hungary
Thanks Mad!

One more question:

What is the situation with the phase in your SEWA V1?
I mean: source-follower circuits doesn't change the phase, but if I use the BOZ preamp that change the phase need I invert the speaker + and - connections in the SEWA output?
With my BOZ+ZenLite it is not problem because both amp are phase shifter.

Greets:

Tyimo
  Reply With Quote
Old 1st March 2006, 08:40 PM   #88
Frank40 is offline Frank40  Denmark
diyAudio Member
 
Frank40's Avatar
 
Join Date: May 2004
Location: My workshop :-)
Sorry Mad_k for bargeing in to you topic, It seems that I can not delete my postes in here.

To Lineup, thanks for you helpe whit the pic.

Frank
  Reply With Quote
Old 1st March 2006, 09:16 PM   #89
Mad_K is offline Mad_K  Norway
diyAudio Member
 
Mad_K's Avatar
 
Join Date: Sep 2002
Location: Norway
Tyimo; you are right. SEWA/source followers are non inverting, so you will have to invert the speaker terminals to have absolute phase correct when driven from BOZ.

Frank; it's ok, but I think it is better to stay on topic, or else things may get very confusing (as I've already managed by shifting names on my designs)
__________________
Mads K
  Reply With Quote
Old 12th March 2006, 05:13 PM   #90
Tyimo is offline Tyimo  Hungary
diyAudio Member
 
Join Date: Nov 2002
Location: Hungary
Hi Mad!

One more question: should I use different Mosfets for Q1 and Q2?
I mean for Q1=IRFP044 and for Q2= IRFP240?

Greets:

Tyimo
  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 04:44 PM


New To Site? Need Help?

All times are GMT. The time now is 09:40 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