Another low distortion buffer - diyAudio
Go Back   Home > Forums > Source & Line > Analog Line Level

Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

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 24th February 2014, 06:02 PM   #1
diyAudio Member
 
jerluwoo's Avatar
 
Join Date: Feb 2006
Location: Ashland,Ky U.S
Default Another low distortion buffer

Just a simple circuit I've been playing with.
Attached Images
File Type: jpg ScreenHunter_01 Feb. 24 14.00.jpg (51.2 KB, 484 views)
  Reply With Quote
Old 26th February 2014, 04:35 AM   #2
RNMarsh is offline RNMarsh  United States
diyAudio Member
 
RNMarsh's Avatar
 
Join Date: May 2012
Location: 2457 Cascade Trail; Cool, CA. 95614
Do you have any distortion numbers for it. Waveforms at clipping. A way to adjust offset so that the input coupling cap (C3) can be eliminated?


THx-RNMarsh
  Reply With Quote
Old 26th February 2014, 11:29 AM   #3
diyAudio Member
 
jerluwoo's Avatar
 
Join Date: Feb 2006
Location: Ashland,Ky U.S
2Vrms into 1kohm - .004% @ 1kHz - .008% @ 20kHz
Attached Images
File Type: jpg ScreenHunter_02 Feb. 26 07.11.jpg (524.8 KB, 390 views)
File Type: jpg ScreenHunter_03 Feb. 26 07.14.jpg (525.8 KB, 351 views)
File Type: jpg ScreenHunter_04 Feb. 26 07.15.jpg (169.6 KB, 314 views)
File Type: jpg ScreenHunter_05 Feb. 26 07.15.jpg (209.3 KB, 304 views)
File Type: jpg ScreenHunter_06 Feb. 26 07.20.jpg (481.8 KB, 132 views)

Last edited by jerluwoo; 26th February 2014 at 11:38 AM.
  Reply With Quote
Old 27th February 2014, 09:36 AM   #4
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Is the output rail to rail?
__________________
regards Andrew T.
  Reply With Quote
Old 27th February 2014, 04:37 PM   #5
RNMarsh is offline RNMarsh  United States
diyAudio Member
 
RNMarsh's Avatar
 
Join Date: May 2012
Location: 2457 Cascade Trail; Cool, CA. 95614
Very nice and with only 5 transistors.

-RNM
  Reply With Quote
Old 6th March 2014, 01:31 AM   #6
ammel68 is offline ammel68  United States
diyAudio Member
 
Join Date: Sep 2009
Location: Southeast, U.S.
Since it doesn't look like jerluwoo is going to answer my PM, I'll ask here if anyone knows where one can get the BC550/560 transistors in this design?

A Google search didn't turn up much. Are these old transistors?

Thanks...
  Reply With Quote
Old 6th March 2014, 08:33 AM   #7
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
a multi source old transistor that performs very well within it's limits and is generally easily available at very low prices.

Now also available in sot23 (SMD).
__________________
regards Andrew T.
  Reply With Quote
Old 6th March 2014, 11:45 AM   #8
diyAudio Member
 
Join Date: Nov 2004
Location: Germany
BC550B/C (npn) and BC560B/C (pnp) are the European generic low-noise / high-beta transistors. They must have been made since the late '70s or so? You can get transistors with higher Vceo for this level of Cob and beta nowadays, and their Rbb' still is above 100 ohms, but still when you need a cheap small-fry transistor that'll keep its beta well at small Ic and doesn't need to sustain any outlandish voltages, these aren't a bad bet.

Surface mount versions are called BC850 and BC860, respectively.
  Reply With Quote
Old 6th March 2014, 04:33 PM   #9
ammel68 is offline ammel68  United States
diyAudio Member
 
Join Date: Sep 2009
Location: Southeast, U.S.
From looking at the data sheets, the Hfe goes up as you go from the A, B, or C versions.

Jerluwoo shows the "A" version for the BC560 and "B" version for the BC550.
Will substituting the "C" version, which seems easier to find in the TO-92 style, still work in the above circuit or does one have to use the "B" versions for the 550 and "A" version for the 560?

Thanks...
  Reply With Quote
Old 6th March 2014, 04:48 PM   #10
diyAudio Member
 
keantoken's Avatar
 
Join Date: Aug 2006
Location: Texas
Blog Entries: 2
The BC5xx transistors also have exceedingly good low-Vcesat behavior, something that I haven't seen in any of the higher voltage "equivalents".
  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
Ultra-low distortion HP buffer macplauder Solid State 0 3rd August 2013 01:12 PM
Suggestions for a very low distortion class A headphone buffer ionomolo Solid State 28 1st June 2012 12:27 PM
Low-distortion Class-A line/headphone buffer linuxguru Analog Line Level 8 13th November 2010 07:00 AM
Simple Low Distortion JFET Buffer wrenchone Solid State 21 29th January 2007 08:16 PM
Best low-noise low-distortion buffer? borges Solid State 7 9th December 2003 12:40 PM


New To Site? Need Help?

All times are GMT. The time now is 01:27 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