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Old 31st December 2001, 04:20 AM   #1
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Default 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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Old 31st December 2001, 04:42 AM   #2
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Apples vs oranges depends which you prefer.

My choice is OPA-2604's
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Old 31st December 2001, 06:52 PM   #3
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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.
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Old 31st December 2001, 07:27 PM   #4
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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.
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Old 1st January 2002, 11:34 PM   #5
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Hi,

another nice sounding dual-opamp is burr browns OPA2107

william
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Old 2nd January 2002, 04:15 AM   #6
djk is offline djk
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"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.
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Old 2nd January 2002, 05:26 AM   #7
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How does the National LF411ACN fair?
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Old 2nd January 2002, 03:17 PM   #8
grataku is offline grataku  United States
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Tried the lm6172 they seem to be working fine.
If I were to do it over I would buy something else, definitely something cheaper.
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Old 2nd January 2002, 04:33 PM   #9
joe is offline joe  Germany
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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)
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Old 2nd January 2002, 04:50 PM   #10
tvi is offline tvi  Australia
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<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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