do i find another better F5 - diyAudio
Go Back   Home > Forums > Amplifiers > Pass Labs
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

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 26th October 2008, 09:05 AM   #1
diyAudio Member
john-china's Avatar
Join Date: Feb 2001
Location: where fair living
Default do i find another better F5

look at f5 circuit.
when i disconnect GND from resistor of JFET souce pin, i found better performance in my simulation circuit.

in orignal f5 circuit , i got distortion =0.02% ,gain = 5 , dc offset=250mv
in no-ground f5 circuit , i got distortion=0.009%, gain=0.8(too small) dc offset = 80mv

BTW, my attachment pic is not mine , which is from website.
i use multisim from NI to simulate F5.

can somebody tell why ,which one is better.
Attached Images
File Type: gif simulation.gif (29.3 KB, 369 views)
Maybe i should not be lazy again
  Reply With Quote
Old 26th October 2008, 09:46 AM   #2
diyAudio Member
analog_sa's Avatar
Join Date: Aug 2002
Location: Cascais
I don't have the original circuit but looking at your attachment it seems you have increased the negative feedback, hence the reduction in gain and distortion.
  Reply With Quote
Old 26th October 2008, 09:48 AM   #3
Magura is offline Magura  Denmark
diyAudio Member
Magura's Avatar
Join Date: Oct 2003
Location: Denmark, Viborg
If you take a look at your figures, you'll see that the distortion per dB of gain, is higher in the 0.8dB gain version.


Edit: Not that I see a reason to lower the distortion of the original circuit??
Everything is do the impossible just takes a little while longer.
  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
Know where I might find this sub? Dominick22 Subwoofers 1 16th August 2006 08:39 PM
Where can I find this Pot US? jealousblues Parts 0 20th July 2006 04:08 PM
Help me find a job lawbadman Everything Else 28 14th June 2006 12:30 PM
$1 AMP find dougv Tubes / Valves 32 6th June 2004 08:03 PM
please tell me where to find kaukasion Solid State 3 3rd July 2003 09:58 AM

New To Site? Need Help?

All times are GMT. The time now is 04:45 AM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2