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Old 14th April 2012, 05:49 PM   #1
BRSHiFi is offline BRSHiFi  United States
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Default Gyrator Filter

http://www.triodeel.com/images/b9b.gif

The filters for this EQ look like a type of gyrator. Does anyone know the equations on how to calculate the resistor and capacitor values based off of Fc and Q?

The only reliable gyrator source I was able to find used opamps which are easy enough to work with, but nothing for tubes.
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Old 14th April 2012, 07:11 PM   #2
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Old 14th April 2012, 07:14 PM   #3
BRSHiFi is offline BRSHiFi  United States
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The inverting and non inverting inputs are both used.

http://upload.wikimedia.org/wikipedi...mp_Gyrator.svg

Last edited by BRSHiFi; 14th April 2012 at 07:16 PM.
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Old 14th April 2012, 08:13 PM   #4
tinitus is offline tinitus  Europe
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thought I had seen another thread

Tone controls
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Old 15th April 2012, 12:19 AM   #5
Simon B is offline Simon B  United Kingdom
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Both inputs are shown as being used, and the diagram is a bit ic specific. The op-amp is wired as a unity gain voltage follower, with hi-z in, lo-z out.

Perhaps this might help:

gyrator_circuit_block.gif

The voltage follower can be implemented with valves, transistors or ic op-amps. This also applies to operational amplifiers.
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Old 15th April 2012, 03:04 AM   #6
BRSHiFi is offline BRSHiFi  United States
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Guitar Pedals: Gyrator Filter Calculator

I found a calculator here for determining the values of the center frequency and Q factor. Anyone know what the equations are?

I know that:

- The amplifier, R, and C substitute for an inductor. Each inductor has a Q factor. This can obviously be influenced by R and C for a synthetic inductor.

- RL is the series resistor for the inductor substitute.

- center frequency = BQ

- L = Rl * R * C
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