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Old 31st January 2002, 05:31 PM   #1
grataku is offline grataku  United States
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Default 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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Old 1st February 2002, 10:38 AM   #2
djk is offline djk
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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.
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Old 1st February 2002, 06:25 PM   #3
grataku is offline grataku  United States
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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?
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