Low Noise opamps for 2014?

[hjf]

I'm making some audio opamp circuits, some LPF (for subwoofers), some summing amp circuit, etc.

Usually I go for TL072 and NE5532, but I was wondering, what opamps do you use nowadays?

I'm looking for low noise, decent slew rate, and not exaggerated bandwidth. And most important of all: sane price. No $25 opamps for a silly audio filter!

 

[Michael Bean]

OPA2134 DigiKey OPA2134

Mike

 

[djoffe]

OPA2134...They look nice...

These are also pretty nice:

http://www.ti.com/lit/ds/symlink/lme49720.pdf

although I'm not sure...the 50 MHz bandwidth might be wide enough to make you uncomfortable...

 

[Michael Bean]

although I'm not sure...the 50 MHz bandwidth might be wide enough to make you uncomfortable...

That's why I didn't mention it. It's hard to beat when used wisely, but it MUST be used wisely.

Mike

 

[hjf]

I also found AD8599 though it's a bit more expensive.

 

[JOHN BALI]

LM4562NA it is also similar I think 🙂
try the LM4562HA too that somebody says it is superb...
with high performance opamp the PSU & decoupling caps should be wise too.

I read again post #1, but for "only" low frequency/LPF NE5532, LM833 or other bipolar type input maybe sound not so different...

You can try it by yourself, you can have fun to try bipolar type opamp & compare it to jfet type for your LPF... lets start with NE5532 vs TL072 😀

some expensive opamp need better PSU too, to sound at it best

 

[Michael Bean]

I don't know if it's a problem for you but the AD8599 is only available in surface mount. It does look like a descent one for audio.

Mike

 

[hjf]

some expensive opamp need better PSU too, to sound at it best

i saw LT3032

ultralow noise dual regulator... only 150mA though. but 20uV noise! and +/- in a single IC

 

[Passinwind]

Usually I go for TL072 and NE5532, but I was wondering, what opamps do you use nowadays?

OPA 2132/2134

LM4562/LME49720

LT1124

 

[hjf]

OPA 2132/2134

LM4562/LME49720

LT1124

LME49xxx is mentioned a lot
let's go all the way up to LME49990! so many 9s! that MUST be the top of the line, no?

Ultra low noise, ultra low distortion. From the Overture E-series.

Overture as in LM3886? 😀

 

[vzaichenko]

OPA627 (Burr-Brown)

Noise - 4.5nV/√Hz at 10kHz

OPA627 datasheet pdf datenblatt - Burr-Brown Corporation - Precision High-Speed Difet OPERATIONAL AMPLIFIERS ::: ALLDATASHEET :::

I use them in active subsonic filter - top notch performance.
Rather expensive though.

 

[hjf]

OPA627 (Burr-Brown)

Noise - 4.5nV/√Hz at 10kHz

OPA627 datasheet pdf datenblatt - Burr-Brown Corporation - Precision High-Speed Difet OPERATIONAL AMPLIFIERS ::: ALLDATASHEET :::

I use them in active subsonic filter - top notch performance.
Rather expensive though.

that's cheating! we said no $25 opamps. that one is $25! 😛

 

[Michael Bean]

Do you have an O-scope that has at least 50 MHz bandwidth? Pretty much mandatory when using those LM4562 class devices, or any high speed opamp really.

Mike

 

[vzaichenko]

that's cheating! we said no $25 opamps. that one is $25! 😛

Ah, sorry - did not actually notice that condition right away 🙂
Yeah, that's the only downside of this opamp ((

In my case, on one hand, it's a silly audio filter, cutting some ultra-low frequencies, on the other hand, it passes everything else. In 7 channels. It has to pass it perfectly 😉

 

[geraldfryjr]

I am very found of the LT stuff, To many to list!!!

Also besides TI's LMExxx's the OPA1664 has pretty impressive specs as well.

jer 🙂

 

[FdW]

What about Audio - Audio Operational Amplifier - LME49880 - TI.com and Audio - Audio Operational Amplifier - LME49710 - TI.com, I have been using them in a RIAA amp and it sounds very nice (also MC). See also http://www.diyaudio.com/forums/analogue-source/165603-balanced-input-all-dc-coupled-riaa-preamp.html

 

[Vostro]

Wow didn't know opamps get that expensive.
In my country OPA627BP cost 76.32 USDollars each if you include VAT tax.

Lol now I guess I'll never know how they sound in a preamp 🙂

 

[FdW]

OPA627 (Burr-Brown)

Noise - 4.5nV/√Hz at 10kHz

OPA627 datasheet pdf datenblatt - Burr-Brown Corporation - Precision High-Speed Difet OPERATIONAL AMPLIFIERS ::: ALLDATASHEET :::

I use them in active subsonic filter - top notch performance.
Rather expensive though.

4.5nV/Hz is not very good, I think you are better of using one of the LME's

 

[vzaichenko]

4.5nV/Hz is not very good, I think you are better of using one of the LME's

LME49880 - 7nV/√Hz

Does not matter - both are very low

 

[vzaichenko]

Wow didn't know opamps get that expensive.
In my country OPA627BP cost 76.32 USDollars each if you include VAT tax.

Lol now I guess I'll never know how they sound in a preamp 🙂

I purchased them for $30 each. 3 pieces per channel x 7 channels = 21 piece.
I know, I'm crazy 😀 But I'm a skydiver anyway, so... no surprise 😛

Here is the link to my design:
Bloody expensive 7-channel Subsonic filter

5-th order Chebyshev
They sound very good