NE5532 or LM833? For this balanced mic pre-amp - diyAudio
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Old 23rd June 2007, 05:14 AM   #1
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Question NE5532 or LM833? For this balanced mic pre-amp

I've built 8 channels of this classic circuit, it was modified by a friend and me for linear gain control and RF rejection. The first stage gain is 10 and the diff. amp stage max. gain is 100 so the total gain of the circuit is 1000 or 60 dB.

Im looking for the lowest possible noise (without adding a parallel transistor input stage) and the best possible performance out of one of those chips. Currently it is working with NE5532.

I know there are better op amps, but they are not available here, so these are my only 2 options:

LM833 or NE5532...

Based on data sheet info LM833 has 4.5 nV/sqrt(Hz) of input noise VS 5 nV/sqrt(Hz) of NE5532 (NE5534 is quieter but I need a dual chip). So LM833 is quieter.

What do you think?


Thanks in advance.

- Marc Fricke Baptiste
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Old 23rd June 2007, 05:34 AM   #2
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I would use a modern dual audio op, like LM4562.
You can also use an adaptor 2xSOIC->dual op.
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Old 23rd June 2007, 07:37 PM   #3
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Talking Dream on....

Thanks for your reply, that op amp is not available in the country Im living right now, only TI NE5532 (sold here 0.4 dollars each), National LM833N (sold here 0.7 dollars each) and B-B OPA2134 (sold here at aprox 3 dollars each!) so my possibilities are limited....
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Old 23rd June 2007, 07:48 PM   #4
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The 5532 is a good chip, nothing wrong with it really. You will probably find it is inside any professional equipment you buy
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Old 24th June 2007, 12:15 AM   #5
sandyK is offline sandyK  Australia
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Default NE5532 or LM833

Frickecello

The OPA2134 is an excellent replacement for the NE5532, and IMHO, well worth the extra cost. I have replaced 5532s in a DAC with OPA2134, and there was a very audible improvement.
SandyK
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Old 24th June 2007, 02:43 AM   #6
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but with microphone amplification, noise may be become important
with low source impedances the NE5532A is difficult to beat.
regards
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Old 24th June 2007, 02:59 AM   #7
sandyK is offline sandyK  Australia
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Default NE5532 or LM833

Perhaps, but I think I would prefer (perhaps) a little more random noise at very low levels without harsh distortion residuals. The OPA 2134 would have a much cleaner sounding residual noise component due to it's ultra low distortion ?
SandyK
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Old 24th June 2007, 03:17 AM   #8
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don't know, didnot mastered the sound of opamps yet.

regarding DAC-stages I prefer OP275!
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Old 24th June 2007, 03:49 AM   #9
sandyK is offline sandyK  Australia
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Default NE5532 or LM833

I am using OPA2134 in a heavily modified Musical Fidelity
X-DAC V3, but with the very much faster AD8066 in the O/P
stage. They complement each other very nicely, with a HUGE soundstage when fed into a Class A preamp and 15W/Ch. Class A amplifier.
SandyK
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Old 24th June 2007, 05:59 AM   #10
fotios is offline fotios  Greece
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I agree absolutely with richie00boy in what writes. The same i have ascertained also me in professional mixing desks. One chip that i have seen until now which replaces the NE5532 or the NE5534 it is from the newer versions SSM2015 or SSM2220 of Analog Devices. The reason for the NE5532 of course is that which very rightly reports jurgenk.
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