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Old 14th January 2003, 08:16 PM   #1
Bricolo is offline Bricolo  France
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Default what is this crossover's function?

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?
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Old 15th January 2003, 01:43 PM   #2
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looks like the beginning of a phase shifter.
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Old 15th January 2003, 01:59 PM   #3
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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I.e. if it is driven by a low-impedance source then it is simply an integrator and the resistor from input to output is obsolete.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
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Old 15th January 2003, 04:05 PM   #4
Bricolo is offline Bricolo  France
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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 (200F) and the speaker jack
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Old 16th January 2003, 11:03 PM   #5
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Default OPAMP

Hi,

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

Cheers,
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Old 16th January 2003, 11:15 PM   #6
Bricolo is offline Bricolo  France
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since the same with caps and resistors inverted is a band pass
wouldn't this one be a band reject filter?
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Old 5th February 2003, 02:38 PM   #7
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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
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