Marsh headphone amp from Linear Audio - Page 13 - diyAudio
Go Back   Home > Forums > Amplifiers > Headphone Systems

Headphone Systems Everything to do with Headphones

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 23rd May 2012, 09:21 PM   #121
diyAudio Member
 
dirkwright's Avatar
 
Join Date: May 2011
Location: Virginia
This one is a bit better. Output is just shy of 1V rms. Bandwidth is good with no funny stuff. You're gonna need some massive heatsinks though...
Attached Images
File Type: jpg Diamond buffer bare thd.JPG (81.4 KB, 700 views)
  Reply With Quote
Old 23rd May 2012, 09:32 PM   #122
SY is offline SY  United States
diyAudio Moderator
 
SY's Avatar
 
Join Date: Oct 2002
Location: Chicagoland
Blog Entries: 1
Ed's point is that a sim is nice, but real pieces of silicon, carbon, and copper may not give you what the sim predicts. RM's circuit performance as a real, built item is outstandingly good. Makes me want to try to do better using vacuum tubes...
__________________
And while they may not be as strong as apes, don't lock eyes with 'em, don't do it. Puts 'em on edge. They might go into berzerker mode; come at you like a whirling dervish, all fists and elbows.
  Reply With Quote
Old 23rd May 2012, 09:40 PM   #123
diyAudio Member
 
Join Date: Nov 2008
Location: Oakmont PA
Quote:
Originally Posted by SY View Post
Ed's point is that a sim is nice, but real pieces of silicon, carbon, and copper may not give you what the sim predicts. RM's circuit performance as a real, built item is outstandingly good. Makes me want to try to do better using vacuum tubes...
Might not!!!??? I have some simulated amplifiers that are so close to perfect it is scary. Of course when you build them they don't come close. Then after you tweak in all the real values they still don't!

Reminds me of the internet dating beauty....
  Reply With Quote
Old 23rd May 2012, 09:40 PM   #124
diyAudio Member
 
dirkwright's Avatar
 
Join Date: May 2011
Location: Virginia
Quote:
Originally Posted by SY View Post
Ed's point is that a sim is nice, but real pieces of silicon, carbon, and copper may not give you what the sim predicts. RM's circuit performance as a real, built item is outstandingly good. Makes me want to try to do better using vacuum tubes...
I fully realize that. So, even if it's twice as much distortion, we're still talking 0.0004%. OK, make it ten times as bad... 0.002%... big hoop dee doo.

I'm looking at peltier devices for cooling... hahaha.


You wanna do this with tubes?!?!? Your headphone amp is going to double as a space heater.
  Reply With Quote
Old 23rd May 2012, 09:47 PM   #125
SY is offline SY  United States
diyAudio Moderator
 
SY's Avatar
 
Join Date: Oct 2002
Location: Chicagoland
Blog Entries: 1
Quote:
Originally Posted by dirkwright View Post
You wanna do this with tubes?!?!? Your headphone amp is going to double as a space heater.
Can't deny THAT.
__________________
And while they may not be as strong as apes, don't lock eyes with 'em, don't do it. Puts 'em on edge. They might go into berzerker mode; come at you like a whirling dervish, all fists and elbows.
  Reply With Quote
Old 23rd May 2012, 10:30 PM   #126
coluke is offline coluke  Italy
diyAudio Member
 
Join Date: Mar 2009
Dirk, I know that DBs work very well - already tried a simple unitary gain DB buffer (open-loop: there's more than one way to do it... ) with CCS on input bjt emitters and CFPs on output: it rocks.
Nevertheless, I'm afraid I can't get the point. I mean: you can build the DB you simmed, measure it, listen to it and then - if it works well and _as expected_) eventually submit it to Janneman's LA. Then someone will pop up and say: Damn, why another discrete DB? Wht not a 49600? Why not a simpler power follower with an active load...? There's more than one way to do it (yeah, I'm a PERL fan...), and probably my way is different from yours or Richard's - to me electronic design is a matter of good engineering practices * and * personal taste: as long as the former are obeyed...

L.
  Reply With Quote
Old 23rd May 2012, 10:49 PM   #127
diyAudio Member
 
dirkwright's Avatar
 
Join Date: May 2011
Location: Virginia
Quote:
Originally Posted by SY View Post
Can't deny THAT.
Sy, this is for you. Enjoy.
Attached Images
File Type: jpg KT88 srpp amp.JPG (111.6 KB, 688 views)
  Reply With Quote
Old 23rd May 2012, 10:54 PM   #128
diyAudio Member
 
dirkwright's Avatar
 
Join Date: May 2011
Location: Virginia
Quote:
Originally Posted by coluke View Post
Dirk, I know that DBs work very well - already tried a simple unitary gain DB buffer (open-loop: there's more than one way to do it... ) with CCS on input bjt emitters and CFPs on output: it rocks.
Nevertheless, I'm afraid I can't get the point. I mean: you can build the DB you simmed, measure it, listen to it and then - if it works well and _as expected_) eventually submit it to Janneman's LA. Then someone will pop up and say: Damn, why another discrete DB? Wht not a 49600? Why not a simpler power follower with an active load...? There's more than one way to do it (yeah, I'm a PERL fan...), and probably my way is different from yours or Richard's - to me electronic design is a matter of good engineering practices * and * personal taste: as long as the former are obeyed...

L.
Well, that's why I will never submit it to a magazine...

I was just playing around. Someone mentioned the idea of doing something great with a buffer with as few transistors as possible. So, thus the gauntlet was thrown down.... at least I had the guts to rise to the challenge. What's your circuit that meets those requirements? Can you show one? Come on, I'm waiting... Do you have a SE mosfet circuit lying around that sims good? Ha, I bet Mr. Pass can come up with something fantastic with ONE transistor... HAHAHA. Me, I'm not that talented.
  Reply With Quote
Old 23rd May 2012, 11:29 PM   #129
SY is offline SY  United States
diyAudio Moderator
 
SY's Avatar
 
Join Date: Oct 2002
Location: Chicagoland
Blog Entries: 1
Quote:
Originally Posted by dirkwright View Post
Sy, this is for you. Enjoy.
If you're trying to do it the most inefficient way possible, that will certainly work.
__________________
And while they may not be as strong as apes, don't lock eyes with 'em, don't do it. Puts 'em on edge. They might go into berzerker mode; come at you like a whirling dervish, all fists and elbows.
  Reply With Quote
Old 24th May 2012, 12:04 AM   #130
RNMarsh is offline RNMarsh  United States
diyAudio Member
 
RNMarsh's Avatar
 
Join Date: May 2012
Location: 2457 Cascade Trail; Cool, CA. 95614
The throw down is for a Gain stage -- DA -- the Diamond Amplifier. The DB was invented and patented by R. Baker of MIT and first presented at IEEE conference in 1963.
  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
FS: Meier Audio Corda Headphone Amp jtwrace Swap Meet 5 29th February 2012 12:34 PM
Histoically significant - Phase Linear audio pre-amp bobcul Swap Meet 0 21st February 2012 09:16 PM
Headphone amp with mixed-in telephone audio krfjr1965 Solid State 3 10th March 2010 04:50 PM


New To Site? Need Help?

All times are GMT. The time now is 05:00 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