gyrator and active crossover

grataku · 31st January 2002, 05:31 PM

The gyrator...got to love the name if nothing else.
You can sure brag about having one of these babies in stereo.
Not to be confused with a gyrotron!

Anyways, has anyone looked at these before?
http://www.crossovers.com/figure_4.html
looks pretty ideal, no opamps in the signal path, easy to deal R and C's.

Although, a simple buffered filter circuit looks even simpler.
http://www.crossovers.com/figure_3.html
How about BOSOZs as input and output buffers...

djk · 1st February 2002, 10:38 AM

Uhh, I see op-amps in the GIC circuit. People also overlook the op-amps in DC servo circuits too. Just because a component is going to ground you think it has no effect on the sound? Have you ever tried to build a passive four pole filter? Stick to three poles or less.

grataku · 1st February 2002, 06:25 PM

djk,
no I have never tried to build a low power passive 4 pole filter. Would you care to shine some light on why 4th order buffered filter would that be bad?
I am simply looking for a better way to do active filtering without having so many opamps on the line. Why have I bothered with the BOSOZ if I then need to tar up the signal path with 4 opamps?

31st January 2002, 05:31 PM	#1
grataku diyAudio Member Join Date: Dec 2000 Location: -	gyrator and active crossover The gyrator...got to love the name if nothing else. You can sure brag about having one of these babies in stereo. Not to be confused with a gyrotron! Anyways, has anyone looked at these before? http://www.crossovers.com/figure_4.html looks pretty ideal, no opamps in the signal path, easy to deal R and C's. Although, a simple buffered filter circuit looks even simpler. http://www.crossovers.com/figure_3.html How about BOSOZs as input and output buffers...

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1st February 2002, 10:38 AM	#2
djk diyAudio Member Join Date: Feb 2001 Location: USA	Uhh, I see op-amps in the GIC circuit. People also overlook the op-amps in DC servo circuits too. Just because a component is going to ground you think it has no effect on the sound? Have you ever tried to build a passive four pole filter? Stick to three poles or less.

1st February 2002, 06:25 PM	#3
grataku diyAudio Member Join Date: Dec 2000 Location: -	djk, no I have never tried to build a low power passive 4 pole filter. Would you care to shine some light on why 4th order buffered filter would that be bad? I am simply looking for a better way to do active filtering without having so many opamps on the line. Why have I bothered with the BOSOZ if I then need to tar up the signal path with 4 opamps?