Opamps for active crossover/filter

harvardian · 31st December 2001, 04:20 AM

Hello,

I am building the Linkwitz active crossover boards and the chosen opamp is the BB OPA2134. Has anyone tried a LM6172 or LT1364 in this application? Besides for oscillation worries, which would work better?

Thanks,

Dale

ThomasW · 31st December 2001, 04:42 AM

Apples vs oranges depends which you prefer.

My choice is OPA-2604's

Jamie F · 31st December 2001, 06:52 PM

I've built the Phoenix crossovers using the 2134's and they are fine.

However, one of the engineers at work recently did a shoot-out, these came second, something else (I'll find out what next week) came first due to noise performance.

Nelson Pass · 31st December 2001, 07:27 PM

I recently tried 2604's in a crossover design, but
I found them only marginally stable in low gain
circuits, and I went right back to discrete.

wuffwaff · 1st January 2002, 11:34 PM

Hi,

another nice sounding dual-opamp is burr browns OPA2107

william

djk · 2nd January 2002, 04:15 AM

"I recently tried 2604's in a crossover design, but
I found them only marginally stable in low gain
circuits, and I went right back to discrete." A while back Analog Devices was having a problem with their AD797s.Supposed to be unity gain stable.They weren't.Just return to the distributor and get a different date code.On a scary note I have a circuit that uses the AD842 at unity gain.This is not a unity gain stable part.About 1/3 of the date codes will actually work over temperature.Don't try this at home.

AudioFreak · 2nd January 2002, 05:26 AM

How does the National LF411ACN fair?

grataku · 2nd January 2002, 03:17 PM

Tried the lm6172 they seem to be working fine.
If I were to do it over I would buy something else, definitely something cheaper.

joe · 2nd January 2002, 04:33 PM

Tried the LM6172 in my CDP (i/u conv. + filter) and found it much better sounding than the opa2134 if it is stable.

Here my personal ranking (tested in outputstage, gain 10):

Standard: NE5532, JRC...

For Beginners: OPA2604

Better: OPA2134; OP275

Premium: OPA2132

State of the Art: LM6172, OPA627/637, AD797 (the latter three are single opamps)

tvi · 2nd January 2002, 04:50 PM

<a href="http://fnt-www.ss.titech.ac.jp/~hajime/uec/distortion/opa.html"> here</a> is a japanese site that has distortion/FFT plots of lotsa opamps, the AD797 measured great.

Regards
James

31st December 2001, 04:20 AM	#1
harvardian diyAudio Member Join Date: Dec 2001 Location: Austin, TX	Opamps for active crossover/filter Hello, I am building the Linkwitz active crossover boards and the chosen opamp is the BB OPA2134. Has anyone tried a LM6172 or LT1364 in this application? Besides for oscillation worries, which would work better? Thanks, Dale

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31st December 2001, 04:42 AM	#2
ThomasW diyAudio Member Join Date: Oct 2001 Location: 5280'	Apples vs oranges depends which you prefer. My choice is OPA-2604's

31st December 2001, 06:52 PM	#3
Jamie F diyAudio Member Join Date: Dec 2001 Location: UK	I've built the Phoenix crossovers using the 2134's and they are fine. However, one of the engineers at work recently did a shoot-out, these came second, something else (I'll find out what next week) came first due to noise performance.

31st December 2001, 07:27 PM	#4
Nelson Pass The one and only Join Date: Mar 2001	I recently tried 2604's in a crossover design, but I found them only marginally stable in low gain circuits, and I went right back to discrete.

1st January 2002, 11:34 PM	#5
wuffwaff diyAudio Member Join Date: Aug 2001 Location: Ingolstadt Germany	Hi, another nice sounding dual-opamp is burr browns OPA2107 william

2nd January 2002, 04:15 AM	#6
djk diyAudio Member Join Date: Feb 2001 Location: USA	"I recently tried 2604's in a crossover design, but I found them only marginally stable in low gain circuits, and I went right back to discrete." A while back Analog Devices was having a problem with their AD797s.Supposed to be unity gain stable.They weren't.Just return to the distributor and get a different date code.On a scary note I have a circuit that uses the AD842 at unity gain.This is not a unity gain stable part.About 1/3 of the date codes will actually work over temperature.Don't try this at home.

2nd January 2002, 05:26 AM	#7
AudioFreak Warp Engineer On Holiday Join Date: Oct 2001 Location: Queensland, Australia	How does the National LF411ACN fair?

2nd January 2002, 03:17 PM	#8
grataku diyAudio Member Join Date: Dec 2000 Location: -	Tried the lm6172 they seem to be working fine. If I were to do it over I would buy something else, definitely something cheaper.

2nd January 2002, 04:33 PM	#9
joe diyAudio Member Join Date: Oct 2001 Location: Hamburg	Tried the LM6172 in my CDP (i/u conv. + filter) and found it much better sounding than the opa2134 if it is stable. Here my personal ranking (tested in outputstage, gain 10): Standard: NE5532, JRC... For Beginners: OPA2604 Better: OPA2134; OP275 Premium: OPA2132 State of the Art: LM6172, OPA627/637, AD797 (the latter three are single opamps)

2nd January 2002, 04:50 PM	#10
tvi diyAudio Member Join Date: Apr 2001 Location: Moonee Ponds, Vic, Australia	<a href="http://fnt-www.ss.titech.ac.jp/~hajime/uec/distortion/opa.html"> here</a> is a japanese site that has distortion/FFT plots of lotsa opamps, the AD797 measured great. Regards James

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