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Old 10th August 2007, 09:26 AM   #1
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Default What about NE5532?

Still in search for a headphone amplifier for my Sennheiser HD-201 head set....

I came accross the attached circuit. What can you say about it?

The complete circuit literature can be seen here.
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File Type: gif ne5532 based headphone amp..gif (3.3 KB, 1269 views)
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Old 10th August 2007, 09:55 AM   #2
Dxvideo is offline Dxvideo  Turkey
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NE5532 (or5534) can drive 600ohm loads. However your headphone is 24ohm. That means just one 5532 will not be enough for a headphone amp.
You may add a buffer to the outputs. May be BUF03 etc...
You may add a push pull output stage with lateral MOSFETs..
You may replace the op-amp with a high current and low gain capabilities one. I strongly recommend that Linear's LT1210... You can use it as non-inverted and unity gain (or more). Its sound is very smooth and as good as my Class A headamp...
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Old 10th August 2007, 03:27 PM   #3
AndrewT is online now AndrewT  Scotland
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Hi,
if you want to use opamps and IC solutions for this duty then I suggest the first thing you do is get into Walt Jung's site and read up about applying opamps and buffers to good audio effect.
He has details in there of a variety of very good audio circuits. Check out his compound opamp pair for driving low impedance loads.

He also has given us the opamp bible in PDF format which you should take to bed with you if you are serious.
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Old 10th August 2007, 08:12 PM   #4
KSTR is offline KSTR  Germany
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TI's TPA6120A is THE headphone amp chip at the moment and top-notch audio-opamp for many applications.

Apparantly originally a ADSL-driver, THS6012 (AD815 upgrade), re-labelled and a little re-spec'd for audio use (spec sheet is identical in almost any key parameter)

As for W.Jung:
www.waltjung.org

Regars, Klaus
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Old 13th August 2007, 06:51 AM   #5
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Thanks guys...

I have built the circuit. It's far better than TDA2282 and LM386 chips. The bass is not as powerfull as I wanted it to be, but I can hear it is there. Maybe I whould have that bibble to enhance the circuit.

Thanks again for pointing the way.
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Old 3rd September 2007, 08:54 AM   #6
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Can you please help me to implement this with the NE5532?

Thanks.

Quote:
Originally posted by Dxvideo
NE5532 (or5534) can drive 600ohm loads. However your headphone is 24ohm. That means just one 5532 will not be enough for a headphone amp.

You may add a push pull output stage with lateral MOSFETs..
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Old 3rd September 2007, 01:59 PM   #7
Dxvideo is offline Dxvideo  Turkey
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Do you mean,
Want to make a push pull stage to the output of NE5532?
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Old 4th September 2007, 01:58 AM   #8
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Yes sir!

I feel that the NE5532 is not driving the Sennheiser HD-201 enough and there are lots of room in the headphone not being driven.

I am using the circuit with my iPod. Whenever I connect the amplifier to it, I feel that the music is only amplified a bit because the difference when using the headphone directly and using the headphone plus the amplifier is not that great. I estimate that the sound is just amplified around 25%.

Thanks in advanced for your help.


Quote:
Originally posted by Dxvideo
Do you mean,
Want to make a push pull stage to the output of NE5532?
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Old 4th September 2007, 02:44 AM   #9
Leolabs is offline Leolabs  Malaysia
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Run them in parallel mode.
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Old 4th September 2007, 02:57 AM   #10
paulb is offline paulb  Canada
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Quote:
Originally posted by Dxvideo
Do you mean,
Want to make a push pull stage to the output of NE5532?
http://headwize.com/projects/showfil...=eaton_prj.htm
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