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Opamps in active crossover.

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Posted on December 12, 2016 at 08:52:59
KanedaK
Audiophile

Posts: 683
Location: Brussels
Joined: April 27, 2010



I finished recapping my Cabre AS45 crossover.
New Nichicon MUSE KZ replace the old Nippon Chemicon SM series.
Input and output caps have been replaced with back-to-back Elna Silmic II caps ("super E-cap" position)

so far great improvements!

Now waiting for the 4 BB-OPA2134 to replace the output TL082 opamps. Will add 0,1uF between V- and V+ as generally recommended.

For some reason unexplained (I might just be dumb), I hadn't really paid attention before to the fifth TL082. You can see it here, on the board, not far from the input caps.

Why is it there? Is it some kind of input buffer (I don't have the schematics)
If yes, is it really needed? And if so, I suspect I can also replace it with OPA2134?

PS:I know, I know, I should just look the traces under the board and it will tell me if it's on the signal tracks. I don't know what else it could be. But I'd like to know if I could do without...

 

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RE: Opamps in active crossover., posted on December 12, 2016 at 08:56:40
KanedaK
Audiophile

Posts: 683
Location: Brussels
Joined: April 27, 2010



another view.

 

RE: Opamps in active crossover., posted on December 13, 2016 at 08:21:18
Hornlover
Manufacturer

Posts: 2086
Joined: March 8, 2002
Well, you will need to trace it out to see just what it is doing. If it is an input buffer, you can usually omit it if your source has a low Z output (which most SS equipment does). If you are using tubes as a source, it may not be low Z. If it has a cathode follower output, it is probably low enough.

 

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