Chip buffers - diyAudio
Go Back   Home > Forums > Amplifiers > Chip Amps

Chip Amps Amplifiers based on integrated circuits

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 8th June 2009, 06:26 AM   #1
Atilla is offline Atilla  Norway
diyAudio Member
 
Join Date: Jul 2008
Default Chip buffers

I know a lot of different buffers have been discussed in quite a lot of those forums, but I've been wondering if anyone has experience with the latest and the greatest that is out. What good, chip buffers are there and still available nowadays? The latest mentions for chips that I've seen talk about the LME49600. How does that compare to other commonly used buffers, compared to people's experiences with it? For example, compared to BUF634.

How about trough-hole buffers, for all those SMD-weary? (I'm sure I can solder a TO-263 allright, but just wondering)

They all have a catch somewhere though, the LME49600 is hard for me to find, the BUF634 has definitely worse specs and costs quite a lot of money...

Is anything else worth the try?
  Reply With Quote
Old 8th June 2009, 07:19 AM   #2
Electrons are yellow and more is better!
diyAudio Member
 
peranders's Avatar
 
Join Date: Apr 2002
Location: Göteborg, Sweden
Blog Entries: 4
LME49600 seems to be a slightly better version of BUF634 and you can choose the package according to your own preferences. Since the buffer is a big part it's rather easy to solder even in SMD verision. If you want to solder the one in the picture, just burn for some time and two soldering irons will of course help but it's not necessary.
Click the image to open in full size.
__________________
/Per-Anders (my first name) or P-A as my friends call me
Super Regulator SSR03 Group buy
  Reply With Quote
Old 8th June 2009, 07:58 AM   #3
Atilla is offline Atilla  Norway
diyAudio Member
 
Join Date: Jul 2008
Actually, with this type of package, I've done trough-hole work quite a few times, with the help of some leg-bending. It's not the best solution of course, but it's worked for some small prototypes I've done.

Your headphone amp is quite impressive piece of work, by the way
  Reply With Quote
Old 8th June 2009, 07:14 PM   #4
Electrons are yellow and more is better!
diyAudio Member
 
peranders's Avatar
 
Join Date: Apr 2002
Location: Göteborg, Sweden
Blog Entries: 4
Thanks!
__________________
/Per-Anders (my first name) or P-A as my friends call me
Super Regulator SSR03 Group buy
  Reply With Quote
Old 8th June 2009, 07:45 PM   #5
diyAudio Member
 
theAnonymous1's Avatar
 
Join Date: Feb 2004
Location: Anonymityville
Atilla,

I've built the heaphone amplifier in the LME49600 datasheet and I'm very pleased with it.

Let me know if you are interested in any of these, I have some I can spare if you have trouble sourcing them locally.
  Reply With Quote
Old 8th June 2009, 09:33 PM   #6
Atilla is offline Atilla  Norway
diyAudio Member
 
Join Date: Jul 2008
Mr Anonymous, you've got mail.

So, there's no other buffer IC that people have used that is popular? I know there's noting too much to ask from such a device so the choices are limited. I guess except for those units people would go for discrete diamond and Sijosae buffers...
  Reply With Quote
Old 25th December 2009, 02:33 AM   #7
diyAudio Member
 
zener_diode's Avatar
 
Join Date: Nov 2007
Location: Michigan
The LME49600 is actually quite excellent as a buffer. I measured the THD+N
of it and there is no difference between it and going strait into my ADC.
THD+N at a level of around 1.7v RMS is < .0006% (the limit of my DAC/ADC)
with a load of 5k ohms. Also to note, the higher order harmonics didn't seem to
change, which means that the output transistors on the chip are very closely
matched and don't seam to be adding any crossover distortion. Same spectral
content at about 5mv RMS both with and without the buffer. The noise floor
was also about the same. All this without any negative feedback!
__________________
1N4733
  Reply With Quote
Old 25th December 2009, 07:55 AM   #8
Banned
 
Join Date: Oct 2009
Quote:
Originally Posted by zener_diode View Post
The LME49600 is actually quite excellent as a buffer. I measured the THD+N
of it and there is no difference between it and going strait into my ADC.
THD+N at a level of around 1.7v RMS is < .0006% (the limit of my DAC/ADC)
with a load of 5k ohms. Also to note, the higher order harmonics didn't seem to
change, which means that the output transistors on the chip are very closely
matched and don't seam to be adding any crossover distortion. Same spectral
content at about 5mv RMS both with and without the buffer. The noise floor
was also about the same. All this without any negative feedback!
Did you use it open-loop?
  Reply With Quote
Old 25th December 2009, 07:56 AM   #9
Banned
 
Join Date: Oct 2009
Quote:
Originally Posted by peranders View Post
LME49600 seems to be a slightly better version of BUF634 and you can choose the package according to your own preferences. Since the buffer is a big part it's rather easy to solder even in SMD verision. If you want to solder the one in the picture, just burn for some time and two soldering irons will of course help but it's not necessary.
Click the image to open in full size.
Made with a Macintosh? Does that make it prouder?
  Reply With Quote
Old 25th December 2009, 02:33 PM   #10
diyAudio Member
 
zener_diode's Avatar
 
Join Date: Nov 2007
Location: Michigan
Quote:
Originally Posted by Andrea: View Post
Did you use it open-loop?
Yes, open loop (that's why I said "without any negative feedback").

I also measured the IMD and there was no difference with or without the
buffer, but my setup seems to have high IMD, so maybe there is a tiny
difference that I could not see.
__________________
1N4733
  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
WTB: BUF-634 buffers in TO-220 package KT Swap Meet 1 24th July 2007 05:15 AM
Diamond buffers Nordic Parts 7 13th March 2007 02:13 PM
FS : OPAMPS & Buffers dtm1962 Swap Meet 2 6th October 2006 06:43 PM
WTB el2009c buffers mekanoplastik Swap Meet 0 21st February 2003 10:47 PM
RAM buffers for DAC? dorkus Digital Source 7 21st June 2002 03:14 PM


New To Site? Need Help?

All times are GMT. The time now is 02:29 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