Can I build a headphone amp with NE5532 or TL047CN - 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 9th March 2009, 10:03 PM   #1
diyAudio Member
 
Join Date: Apr 2002
Location: orange ca
Send a message via AIM to travis
Default Can I build a headphone amp with NE5532 or TL047CN

I found a bunch of both of these chips in a drawer and I don't remember what I bought them for.

I have AKG K220M headphones. I think they are 35 Ohm.

I did a quick search here and with google and didn't find anything I liked.
__________________
donuts
  Reply With Quote
Old 10th March 2009, 01:13 AM   #2
diyAudio Moderator Emeritus
 
Iain McNeill's Avatar
 
Join Date: Oct 2007
Location: Santa Cruz, California
I don't think so. IIRC, both these op-amps have highish output impedance (~100ohms I think) which would make it hard to get enough level into 32ohm headphones. You might just get enough level if you run them at max supply voltage but distortion would be compromised.

There's a few tricks like adding a complementary pair of emitter follower transistors inside the feedback loop to get more output.

You could go old school and use an output transformer (if you got two lying around )


Whats the application? Audiophile or mp3?
  Reply With Quote
Old 10th March 2009, 04:17 AM   #3
diyAudio Member
 
Join Date: Apr 2003
Location: Portland,Oregon
Blog Entries: 4
Send a message via AIM to DigitalJunkie
Give the Cmoy headphone amp a try..I built one and used it with my 32ohm phones,sounded fine to me.

http://headwize.com/projects/showfil...=cmoy2_prj.htm
  Reply With Quote
Old 10th March 2009, 04:27 AM   #4
diyAudio Member
 
Join Date: Apr 2002
Location: orange ca
Send a message via AIM to travis
MP3

I've seen that chu moy amp. Are either of these chips compatible with whatever burr-brown he's using? Oh man, I should just look.
__________________
donuts
  Reply With Quote
Old 11th March 2009, 12:20 PM   #5
diyAudio Member
 
kuldeepsingh's Avatar
 
Join Date: Aug 2006
Location: Chennai, India
Send a message via MSN to kuldeepsingh
check out AD8397 ARDZ. high current opamp. It is used on quite a number of portable headphone amps available online (eg, Mini3)
__________________
. . .. ... ..... ........ ............. ..................... ..................................
My Blog
  Reply With Quote
Old 12th March 2009, 12:49 PM   #6
sangram is online now sangram  India
diyAudio Member
 
Join Date: Sep 2002
Location: India
I added (for fun) a 5532 on the output of a PCM2702 DAC to provide a bit of gain. The chip drives my (very basic) earbuds and open-air Panasonic headphones just fine. I don't listen at all to phones, and the distortion is probably a bit higher than I would like, but the fact is that they work. I needed to whole thing to fit into the case that comes with the Alien DAC and the supply is provided by a small regulated supply.

I'm running off +/- 12V regulated rails from a 78xx/79xx series reg. The 'amp' is able to crank a surprising amount of volume into the 32 ohm Pannys, and the Nokia earbuds as well. I cannot turn it up more than halfway without busting my ears. Output offset is about 2mV, so no output cap is required or used. The amp is simple, non-inverting with 6dB gain.

There are obviously much better options, but for almost free, the 5532 works. Not sure about the TL074. I was expecting the chip to self-destruct when presented with a 32 ohm load, but it did not. It probably produces copious amounts of distortion, though. The opamp distortion papers I saw last (Groner) showed the 5532 in distress at 600ohm loads, let alone 32 ohms. A current booster would surely help.
  Reply With Quote
Old 12th March 2009, 10:50 PM   #7
diyAudio Member
 
Join Date: Apr 2002
Location: orange ca
Send a message via AIM to travis
Cool, thanks!

I wonder what I bought these for... Filters?
__________________
donuts
  Reply With Quote
Old 20th April 2009, 08:03 PM   #8
diyAudio Member
 
Join Date: Apr 2002
Location: orange ca
Send a message via AIM to travis
Oooh. I see Elliot Sound uses two of them in parallel at the output of one of his headphone amps. Maybe that was it...

http://sound.westhost.com/project109.htm
__________________
donuts
  Reply With Quote
Old 22nd April 2009, 01:24 AM   #9
Minion is offline Minion  Canada
diyAudio Member
 
Join Date: May 2006
Location: Cowican Bay , vancouver island
You could also paralell the output of 2 opamps to drive lower impedance loads , or add a discrete output stage to an opamp useing low power transistors like BD139 ....

Cheers
  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
NE5532 as a pre amp for a Szekeres headphone amp zebra100 Headphone Systems 2 1st July 2009 09:15 AM
My first Headphone amp build krish2487 Headphone Systems 8 18th June 2009 06:18 PM
What about NE5532? rhavecilla Chip Amps 12 6th September 2007 03:05 PM
Ne5532 zahlm Parts 3 13th May 2004 09:22 PM
NE5532 suitable for headphone amp ??? Bernhard Headphone Systems 1 28th February 2004 11:50 PM


New To Site? Need Help?

All times are GMT. The time now is 07:34 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