NE5532 or LM387 ?

neazoi · 4th December 2008, 05:44 AM

Hello, I would like a brief review of which of the two chips is better (in terms of noise and gain) when used as a microphone preamplifier.
Thank you

Dxvideo · 4th December 2008, 07:33 AM

NE5532 without any dubt...

peranders · 4th December 2008, 08:08 AM

The LM387 isn't so bad, 1 uV noise. The NE5532 has 5 nV/Hz which is rather close. Personally I would have chosen NE5532.

Dxvideo · 4th December 2008, 08:46 AM

What about the THD levels?
LM387 looks very bad..

neazoi · 4th December 2008, 08:57 AM

Right, I got the idea.
I have a mic preamp using lm387 but I will probably replace it with 5532.

The next stage in the chain is a ne5532 3-band equalizer, which uses a passive filter section (bass treble high) and the 2 buffers of the 5532 as I/O. I would like to know if an active filter section can be made for the mic using the ne5532, as high quality capacitors are too expensive...
any suggestions??

Minion · 4th December 2008, 10:23 PM

Active Filters or Passisve filters it doesn"t matter you are still going to need Capacitors , probably just as many as a Passive tone controll....

The benefit of a Active filter set up is you can also boost frequencies as well as cut were a Passive filter will only cut ....

Cheers

hifimaker · 4th December 2008, 10:42 PM

The NE5534 is a big improvement over the NE5532. They are so darn cheap you can afford to try both.

-David

pacificblue · 5th December 2008, 07:06 AM

This comes as a surprise, because the 5532 is the dual version of the 5534. So for one thing they should sound as similar as can be and for another thing they cannot be replaced with each other without major PCB re-design.

mlloyd1 · 5th December 2008, 07:17 AM

ne5532 is a dual units/package and is unity gain stable.
ne5534 is a single unit/package and is not unity gain stable.
there may be other differences, for example in bias currents; i haven't checked the datasheets for these in many years.

ne55xx series (when properly used) has fairly low thd and can drive low impedance loads.

bjt input parts (like the ne55xx series) are low noise for "low" impedances. depending on your surrounding passive components, you may want to experiment with low noise dual jfet parts also.

good luck!
mlloyd1

Franz Gysi · 10th December 2008, 02:18 PM

Quote:

ne5534 is a single unit/package and is not unity gain stable.

This is wrong. Please read the datasheet.

Franz

4th December 2008, 05:44 AM	#1
neazoi diyAudio Member Join Date: Aug 2007	NE5532 or LM387 ? Hello, I would like a brief review of which of the two chips is better (in terms of noise and gain) when used as a microphone preamplifier. Thank you __________________ Great DIY site: http://www.neazoi.com

4th December 2008, 07:33 AM	#2
Dxvideo diyAudio Member Join Date: Nov 2003 Location: Turkey	NE5532 without any dubt... __________________ Best regards, Ozgur

4th December 2008, 08:08 AM	#3
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4	The LM387 isn't so bad, 1 uV noise. The NE5532 has 5 nV/Hz which is rather close. Personally I would have chosen NE5532. __________________ /Per-Anders (my first name) or P-A as my friends call me

4th December 2008, 08:46 AM	#4
Dxvideo diyAudio Member Join Date: Nov 2003 Location: Turkey	What about the THD levels? LM387 looks very bad.. __________________ Best regards, Ozgur

4th December 2008, 08:57 AM	#5
neazoi diyAudio Member Join Date: Aug 2007	Right, I got the idea. I have a mic preamp using lm387 but I will probably replace it with 5532. The next stage in the chain is a ne5532 3-band equalizer, which uses a passive filter section (bass treble high) and the 2 buffers of the 5532 as I/O. I would like to know if an active filter section can be made for the mic using the ne5532, as high quality capacitors are too expensive... any suggestions?? __________________ Great DIY site: http://www.neazoi.com


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4th December 2008, 10:23 PM	#6
Minion diyAudio Member Join Date: May 2006	Active Filters or Passisve filters it doesn"t matter you are still going to need Capacitors , probably just as many as a Passive tone controll.... The benefit of a Active filter set up is you can also boost frequencies as well as cut were a Passive filter will only cut .... Cheers

4th December 2008, 10:42 PM	#7
hifimaker diyAudio Member Join Date: Oct 2003 Location: San Jose	The NE5534 is a big improvement over the NE5532. They are so darn cheap you can afford to try both. -David

5th December 2008, 07:06 AM	#8
pacificblue diyAudio Member Join Date: May 2008	This comes as a surprise, because the 5532 is the dual version of the 5534. So for one thing they should sound as similar as can be and for another thing they cannot be replaced with each other without major PCB re-design. __________________ If you've always done it like that, then it's probably wrong. (Henry Ford)

5th December 2008, 07:17 AM	#9
mlloyd1 diyAudio Member Join Date: Feb 2001 Location: illinois	ne5532 is a dual units/package and is unity gain stable. ne5534 is a single unit/package and is not unity gain stable. there may be other differences, for example in bias currents; i haven't checked the datasheets for these in many years. ne55xx series (when properly used) has fairly low thd and can drive low impedance loads. bjt input parts (like the ne55xx series) are low noise for "low" impedances. depending on your surrounding passive components, you may want to experiment with low noise dual jfet parts also. good luck! mlloyd1

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