what is this crossover's function?

[Bricolo]

I've seen the same, with the resistances and caps inverted (caps instead of the resistances, and resistances instead of the caps)
but never this one


what it is used for?

 

[jackinnj]

looks like the beginning of a phase shifter.

 

[phase_accurate]

Hi Bricolo

If we don't know more we can't definitely tell.

I.e. if it is driven by a low-impedance source then it is simply an integrator and the resistor from input to output is obsolete.
But I assume that there was more at the input and so we'd like to know more in order to be able to tell you.
One possibility would be part of a bandpass filter.

Regards

Charles

 

[Bricolo]

this op amp is (was on my soundcard)

before the 1st resistor: a 12K resistor and the dac's output

at the output: an output cap (200µF) and the speaker jack

 

[fdegrove]

OPAMP

Hi,

Looks like an active phase-shift compensation network to me.

Cheers,😉

 

[Bricolo]

since the same with caps and resistors inverted is a band pass
wouldn't this one be a band reject filter?

 

[AndrewJ]

with the 12k resistor, this circuit is simply an active 1st order low pass filter. Without component values though it is not possible to determine the cut-off frequency.

Andrew