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Old 6th March 2006, 08:55 PM   #1
percy is offline percy  United States
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Default Buffer headphone amp

Are there any headphone amp designs that use only a buffer opamp ? Just a standalone buffer.
All I need is something to provide high impedance to the source and boost the output current high enough for a typical 32ohm heaphone, ofcourse low output impedance.
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Old 8th March 2006, 07:50 AM   #2
cetoole is offline cetoole  United States
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Not quite what you asked for, but the Szekeres might be a good choice, Class A mosfet buffer.
http://headwize.com/projects/showfil...szeke1_prj.htm
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Old 8th March 2006, 08:45 PM   #3
endia is offline endia  Turkey
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maybe this one is what you're looking for;
A Buffered Headphone Driver
http://headwize.com/projects/showfil...awliw1_prj.htm
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Old 8th March 2006, 09:53 PM   #4
lineup is offline lineup  Sweden
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Default Re: Buffer headphone amp

Quote:
Originally posted by percy
Are there any headphone amp designs that use only a buffer opamp ?
Just a standalone buffer.
All I need is something to provide high impedance to the source
and boost the output current high enough for a typical 32ohm headphone,
of course low output impedance.
A good option is to use a dual Op-Amp, like for example OPA2134 (good quality/price)
and parallel the dual to give double current output.
Will power most every 32 Ohm headphones, more than enough.

At Raymond's DIY Audio Pages I found such a project.
Pictures and schematics, including power supply.
Very nice documentation indeed!
He has also two other headphone amplifiers and more good audio projects.

Quote:
Opamp Headphone Amplifier

This is an headphone amplifier, based on the OPA2134 from Burr-Brown.
Two opamps are used, with one half of each buffering the output of the other half
for increased current capability.
A guy from Finland has built Raymond's project and documented this with images.
He uses PCB he made himself.
http://www.kolumbus.fi/antti.penttala/ele/headamp/


This is schematic:

Click the image to open in full size.
He uses 100k/10k gain=11.
This is changed easily.
Removing 10k resistor (R3) gives gain=1. (Unity gain buffer)
Making R3=100k gives gain=2.


Amplifier image:

Click the image to open in full size.
The small heatsinks are for LM317 LM337 voltage regulator chips.
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Old 8th March 2006, 09:58 PM   #5
lineup is offline lineup  Sweden
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This is a picture of guy from Finland's amplifier a la Raymond.
From link in post above.
You see the two OPA2134 and components placement here:

Click the image to open in full size.
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Old 9th March 2006, 07:49 AM   #6
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Percy

Try the BUF634T from BB/Texas

Have fun

Thomas
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Old 9th March 2006, 04:43 PM   #7
percy is offline percy  United States
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I have seen BUF634 being used in a few diy headphone amps as an output stage preceeded by another opamp but have yet to come across one by itself.

thanks all for the project links. I will check them out.
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Old 9th March 2006, 04:53 PM   #8
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Look at the LT1010, imo a very good choice for that app.
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Old 12th March 2006, 04:32 AM   #9
percy is offline percy  United States
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or the LT1210 maybe ? anyone tried it yet ?
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Old 12th March 2006, 07:07 AM   #10
ChUmI is offline ChUmI  Poland
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percy,

I used LT1210 and it works like a best sounding chip headphone amp in my collection My Sony MDR-F1 headphones have only 12 Ohm and are driven perfectly - so deep bass I never heard form a small chip
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