SE Common source power buffer(ish), a lot of degeneration? - 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
Thread Tools Search this Thread
Old Yesterday, 08:10 PM   #1
OllBoll is offline OllBoll  Sweden
diyAudio Member
Join Date: Nov 2010
Default SE Common source power buffer(ish), a lot of degeneration?

Hello there,

What happens if I use very high source impedance in a F2-ish amp? Say 10 ohm or more? The idea would be to make a very low distortion single ended current buffer with high output impedance.

I guess I could do a feedback loop around it but that's too complicated hence the idea of just using more degeneration

The big question is: would a lot of degeneration do more evil than good and reduce output power or something else or would it be feasible to do?

Also, as 10 ohm source resistors would burn a lot of watts the idea would be to bypass the resistor with an inductor to lower the DC resistance so we don't waste as many watts. The amp only needs to handle 300 and upwards so I can ignore the fact that the gain / degeneration would be inconsistent at lower frequencies.

And the final question, is this just crazy or would it work?
  Reply With Quote
Old Yesterday, 08:30 PM   #2
The one and only
Nelson Pass's Avatar
Join Date: Mar 2001
Unfortunately your bandwidth will suck due to the input capacitance of the Fet.

Probably much better to simply make a voltage follower.

  Reply With Quote
Old Yesterday, 08:31 PM   #3
OllBoll is offline OllBoll  Sweden
diyAudio Member
Join Date: Nov 2010
I guess the idea was more crazy than feasible

Thanks for answering
  Reply With Quote


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
Common Source versus Common Drain output stages alaskanaudio Solid State 36 1st June 2014 02:35 AM
Optimal source degeneration resistance Nick Walker Solid State 6 1st April 2013 11:51 AM
Aleph Topology - Power Follower instead Common Source Power output ? tiefbassuebertr Pass Labs 1 26th June 2011 04:15 PM
Hi(ish) end Simple SE djn04 Tubelab 52 12th October 2009 03:03 PM
Source follower and common source output stages slogan2112 Pass Labs 2 9th October 2008 08:19 PM

New To Site? Need Help?

All times are GMT. The time now is 01:47 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