Simple 2 stage PP fet amplifier - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

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 5th April 2006, 03:16 PM   #1
vuki is offline vuki  Croatia
diyAudio Member
 
vuki's Avatar
 
Join Date: Jun 2002
Location: zagreb, croatia
Default Simple 2 stage PP fet amplifier

I made simple 2 stage push-pull amplifier. It sounds quite nice and measurements are not so bad too.
More about it at http://www.moxtone.com/s2s.htm .
Attached Images
File Type: gif s2s_sch.gif (38.0 KB, 909 views)
  Reply With Quote
Old 5th April 2006, 04:01 PM   #2
hacknet is offline hacknet  Singapore
diyAudio Member
 
Join Date: Nov 2002
Location: sg
im surprised at how the jfets can drive the gate capacitance of the hexfets.
  Reply With Quote
Old 5th April 2006, 04:52 PM   #3
CBS240 is offline CBS240  United States
diyAudio Member
 
CBS240's Avatar
 
Join Date: Aug 2005
Location: K-town
yes there ought to be a driver stage in there somewhere. Also, wouldn't you want to drive the fets with a higher voltage PS than is on the drains for source follower to get rail to rail operation.
__________________
All the trouble I've ever been in started out as fun......
  Reply With Quote
Old 5th April 2006, 05:36 PM   #4
vuki is offline vuki  Croatia
diyAudio Member
 
vuki's Avatar
 
Join Date: Jun 2002
Location: zagreb, croatia
Please, take a closer look at the schematic and measurements.
That's not a source follower on output - output stage has voltage&current gain!
  Reply With Quote
Old 5th April 2006, 06:40 PM   #5
diyAudio Member
 
darkfenriz's Avatar
 
Join Date: Jun 2004
Location: Warsaw
Do you run output stage in class A ?
How is PSRR ?
  Reply With Quote
Old 5th April 2006, 07:00 PM   #6
diyAudio Member
 
Join Date: Aug 2003
Location: Prague,Czech Republic
Voltage gain ? Really ?
  Reply With Quote
Old 5th April 2006, 07:09 PM   #7
vuki is offline vuki  Croatia
diyAudio Member
 
vuki's Avatar
 
Join Date: Jun 2002
Location: zagreb, croatia
@darkfenriz
Ic of output hexfets is 200mA
I don't know PSRR, but with 350mVpp at output PS there is only noise on speaker output and absolutely no hum&noise to be heard on 94dB/W/m sensitive Tannoys.

@Upupa Epops
Voltage gain. Really.
  Reply With Quote
Old 5th April 2006, 07:15 PM   #8
mlloyd1 is offline mlloyd1  United States
diyAudio Member
 
mlloyd1's Avatar
 
Join Date: Feb 2001
Location: illinois
sounds like you're trying to say this is a bit of a hafler transnova clone. my croatian is REALLY bad :-(

never seen it done without using lateral MOSFETs at output.

mlloyd1

Quote:
Originally posted by vuki
Please, take a closer look at the schematic and measurements.
That's not a source follower on output - output stage has voltage&current gain!
  Reply With Quote
Old 5th April 2006, 07:22 PM   #9
vuki is offline vuki  Croatia
diyAudio Member
 
vuki's Avatar
 
Join Date: Jun 2002
Location: zagreb, croatia
@mlloyd
Yes, something like that. Jim Strickland is mentioned in the text as you have maybe seen. It works nice with hexfets, but maybe it would sound even better with lfets?
  Reply With Quote
Old 5th April 2006, 07:22 PM   #10
moamps is offline moamps  Croatia
diyAudio Member
 
Join Date: Oct 2002
Location: Croatia
Quote:
Originally posted by Upupa Epops
Voltage gain ? Really ?
Some background reading:
http://www.tubecad.com/2004/blog0006.htm
  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
Simple phono stage (MC) Onvinyl Analog Line Level 5 9th August 2008 09:50 PM
Simple 12v gain stage dublin78 Solid State 10 14th April 2008 03:37 PM
The NSSPS (Not So Simple Phono Stage) dsavitsk Analogue Source 10 15th November 2005 04:52 AM
simple BJT gain stage hihopes Solid State 2 22nd September 2005 08:19 AM
simple input stage for amp? AudioGeek Solid State 9 3rd September 2004 09:54 PM


New To Site? Need Help?

All times are GMT. The time now is 06:29 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