Headphone Amp Selection? - 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 31st March 2013, 03:05 PM   #1
diyAudio Member
Join Date: Feb 2012
Question Headphone Amp Selection?

Hello Guys,

i am owning a pair of AKG K271 Headphones. Their ratings are 55Ohm and 200mW Pmax, and i want to drive them to the top - talking about voltage. That would make 3,3V - how can I achieve that? I would really be glad if you could tell me about an easy and cheap-to-build amp

Thanks in advance!
  Reply With Quote
Old 1st April 2013, 08:31 AM   #2
diyAudio Member
Join Date: Feb 2003
Location: Australia
Hi Daniel,
The 3.3V requirement refers to the RMS voltage (for a sine wave, which is customary for audio). You'll actually need 4.7V peak and around 100mA peak.

What to recommend depends on whether you want wall power or batteries, and whether you want a PCB or willing to do your own layout. But here are a few options:

O2 - NwAvGuy: O2 Details
M3 - The M Stereo Headphone Amplifier
SDS - SDS Labs Headphone Amplifier | HeadWize
Eaton - Build This High Quality Headphone Amplifier | HeadWize (Gain is very high. I'd suggest changing R5 to 4.7k; and deleting R6 to lighten the load on the opamp; then bootstrapping R7... so many options).
  Reply With Quote
Old 1st April 2013, 04:25 PM   #3
diyAudio Member
Join Date: Feb 2012
Wow, thank you for your answer!

I am thinking of a desktop system, probably powered by an old laptop PSU (19V 2,1A)

PCB is no problem for me, I want to design it by myself and got plenty of manufacturing options in school.

Well, I think I will go for the third option, by SDS Labs.

Again, thank you very much for your help!
  Reply With Quote
Old 2nd April 2013, 01:35 AM   #4
diyAudio Member
Join Date: Feb 2003
Location: Australia
Just bear in mind that your PSU is a single supply (+19V) whereas the SDS amp was designed for a dual supply (+15V and -15V). The SDS can however be made to work with your single supply with a few changes. Search (DIYaudio and the internet) for how to operate opamps from a single supply.
  Reply With Quote
Old 2nd April 2013, 09:04 AM   #5
diyAudio Member
Join Date: Feb 2012
The supply is not a great problem, i have still got a 18-0-18V toroid transformer lying around. i just wanted to get a senseful use for that psu
  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
amp selection? albireo13 Pass Labs 6 7th August 2010 12:48 PM
OP AMP Selection JBL Man Chip Amps 1 16th May 2008 06:42 AM
amp selection spicer81 Car Audio 20 23rd February 2008 03:04 PM
RCA Jack/Plug Selection/Switches Pre-amp & 3875 Premium kit Destroyer OS Chip Amps 15 22nd August 2006 06:43 PM
Amp Selection Donaldo Car Audio 4 25th November 2004 04:59 PM

New To Site? Need Help?

All times are GMT. The time now is 09:11 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