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Old 3rd September 2006, 11:54 PM   #1
Klimon is offline Klimon  Belgium
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Join Date: Apr 2005
Location: Leuven
Default Zobel and notch combined

When using both a parallel notch filter and a zobel filter, is it critical which comes first in the chain?

I've been using a zobel for a little while now but I can't hear any difference when I insert a 50F cap + 7ohms resistor or the standard (textbook value for the claimed self-inductance of beyma 8ag/n) 10 + 7ohms. I thought it was possible to 'over-compensate' but my ears don't agree, unless the notch is screwing the zobel performance up The amp is a triode-strapped el84 se.

And another one: does anyone know a different method to calculate zobels; I've come accross a zobel for Beyma 8ag/n that uses 4,7F + 22ohms ????? I can only find equations that recommend the measured DC resistance of the drivers for the resistor value...

Now we're at it : is DCR of a parallel notch filter coil critical?

Muchas gracias

Simon
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Old 4th September 2006, 12:56 AM   #2
lndm is offline lndm  Australia
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Default Re: Zobel and notch combined

Quote:
Originally posted by Klimon
[B]When using both a parallel notch filter and a zobel filter, is it critical which comes first in the chain?
Just so I don't misunderstand, you mean a filter with the components in parallel, and the entire filter is in series with the driver, right?

A zobel that is intended to equalise the driver's impedance should go closest to the driver.

Quote:
Now we're at it : is DCR of a parallel notch filter coil critical?
To a point, this will lower the Q of the resonance just as the resistor in parallel with the coil does. Therefore, the resistor in parallel can be made a little larger to compensate for a coil with a high DCR.

OTOH, it does make the circuit behave differently below the resonance frequency as the DCR is in series with the driver. It is just as desirable to use a low DCR inductor here as with any time you use a series inductor, IMO.
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Old 4th September 2006, 01:05 AM   #3
Klimon is offline Klimon  Belgium
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Join Date: Apr 2005
Location: Leuven
Quote:
Just so I don't misunderstand, you mean a filter with the components in parallel, and the entire filter is in series with the driver, right?
Yep!

Quote:
OTOH, it does make the circuit behave differently below the resonance frequency as the DCR is in series with the driver. It is just as desirable to use a low DCR inductor here as with any time you use a series inductor, IMO.
That's what I hoped for, a good quality coil has 1/10 DCR of the coil I'm using now. Room for improvement.

Cheers,

Simon
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