What op amps are good for this crossover circuit?

[MikeHunt79]

I'm not sure if this is the right section for this, so can a mod please move if it's wrong...

I want to build this... I'm planning on 112.5Hz crossover frequency.

http://sound.westhost.com/project09.htm

This is going to be in a car, so hifi quality isn't really 100% needed.

I have a bunch of 4558D chips on an old car amp I can use, but these look like they are poor quality from what I've read here.

So can someone recommend me an op amp? I know next to nothing about them...

[Nuuk]

If in doubt stick with something like the trusty old 5532.

[pinkmouse]

And the OPA134 series isn't bad either.

[Leolabs]

Something with FETs inputs and able to operate at unity gain.

[AndrewT]

Hi,
the 5532 can be used for the input buffers.
tl072 or other FET input opamp works for the filter stages.
The output buffers could be another 5532.

If you use tl072, ensure the parasitic capacitance on the outputs of the opamps is minimised. They don't tolerate capacitive loading.

[jethdub]

In reference to previous post, I'm aware of the need to protect chips such as the TL072 from capacititive loading, but just how close to the output pin does the low value R need to be?
Often find myself laying out a circuit and getting nervous about moving the resistor millimetres away.
Also, if a blocking cap is to be used, is there a problem to place it after the load resistor rather than before, as this often allows closer placement of the resistor to the output?

[Tincho]

Mike,

I did that project using TL074 .
I'm using it in a work in progress 2.1 PC sound speaker.
I use ground plane layer and 78xx based PSU.
I drive TDA2003 and TDA2030 directly. I'm planning to change these by lm1875.
Sound is good. No noise No hum

Best,
Tincho

[fernando_g]

The 4558 is a very dated opamp. Used extensively many moons ago, but long superseded by better devices which will not cost you an arm and a leg.

The posters have already made several suitable suggestions above. I've used every single one of those suggested devices and can tell you it will be plenty, for the application you are looking for.

However, I would add to add to the list the BiCMOS cousins of the deservedly famous TL07x BiFET family....For instance the TLC072. They offer several improvements over the standard family, yet they are quite affordable. check yourself this link.
http://focus.ti.com/lit/ds/symlink/tlc072.pdf

[Keruskerfuerst]

In this case, you should use an DIFET/FASTFET or bipolar input opamp.

[juma]

I built it this way :

http://jrexton.ecv.ms/xover.htm