Which design is better for portable linear amplification? - diyAudio
Go Back   Home > Forums > Amplifiers > Headphone Systems
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

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
Thread Tools Search this Thread
Old 14th December 2012, 10:08 PM   #1
diyAudio Member
Join Date: Dec 2011
Default Which design is better for portable linear amplification?

I`m building until Christamas a portable preamp for my headphones. The amp will be powered by 2x9V batteries(or maybe just one 9V battery). I`m trying to drive my headphones, a pair of Audio Technica ATH-M50 (38 ohms, 99db/1mW). I really want to use opamps and BC337/BC327 transistors(if needed) or another transistors if really needed.
I`ve attached 4 design ideas...from long tail pair to sijosae buffer. My question would be this...Which design is more linear and is also capable to drive my headphone (without impedance problems)?
The first circuit is a opamp with a buffered output designed by sijosae.
The second circuit is a opamp with a simple buffered output.
The third circuit is an opamp with an long tail pair transistors for input.
The last circuit is Rod Elliott's design, you can see the article with the circuit here. Can I use here BC337/BC327 transistors here.
And what resistor values should I use? I know that in the first circuit(w/ sijosae buffer) I have to use 2k resistors in place for R5&R6. And for the feedback loop I should use specific resistors, based on what gain I want , but nothing else about choosing resistor values.

PS: Sorry for my english.
PS2: opamp==>OP2134, transistor => BC337/BC327
  Reply With Quote
Old 14th December 2012, 10:31 PM   #2
jcx is offline jcx  United States
diyAudio Member
Join Date: Feb 2003
Location: ..
if you want English reading practice: NwAvGuy: O2 Headphone Amp
  Reply With Quote
Old 16th December 2012, 04:30 AM   #3
jilldwr is offline jilldwr  Canada
diyAudio Member
Join Date: Mar 2005
Location: Midland Ontario
I'd have to second that, the O2 is everything your looking for.
  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
DIY portable, battery powered design exist? doug20 Full Range 1 1st September 2011 01:49 PM
Portable Speaker Design (help needed) Subterraneus Construction Tips 2 19th January 2010 02:10 AM
help pls, challenging design - portable PA tbodin PA Systems 2 29th January 2008 07:49 AM

New To Site? Need Help?

All times are GMT. The time now is 07:48 PM.

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