Parametric Q Calculation--help, please

tocs100 · 1st January 2006, 05:32 PM

Does anyone own a software program that calculates Q? If I gave you the base octave width and the boost in dB, could you you punch this in and tell me the Q (4 filters, total). I'd really appreciate it: I've come pretty close by hand, but I'd like a super-precise readout!

tocs100 · 1st January 2006, 09:30 PM

Oh, I found an online calculator that gave me my Q.

One filter is 700Hz, 0.99 Q. The other is 500Hz, 0.67 Q.

Now, can anyone tell me what value resistors I need to achieve these filters (and gain is something separate, right?)

JensRasmussen · 2nd January 2006, 05:40 AM

I have used a gyrator circuit to build EQ sections in my active filter.

You can download the manual here: http://www.delta-audio.com/Active%20filter%20one.htm

In the manual you will find the topology and equations to design your own EQ.

\Jens

tocs100 · 2nd January 2006, 12:21 PM

Quote:

Originally posted by JensRasmussen

In the manual you will find the topology and equations to design your own EQ.

Thanks Jens! BTW, have you heard from Tiroth lately? I emailed him about a week ago concerning a new Moxlite purchase: still waiting for reply....

1st January 2006, 05:32 PM	#1
tocs100 diyAudio Member Join Date: Dec 2005 Location: Ogden, Utah	Parametric Q Calculation--help, please Does anyone own a software program that calculates Q? If I gave you the base octave width and the boost in dB, could you you punch this in and tell me the Q (4 filters, total). I'd really appreciate it: I've come pretty close by hand, but I'd like a super-precise readout!

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1st January 2006, 09:30 PM	#2
tocs100 diyAudio Member Join Date: Dec 2005 Location: Ogden, Utah	Oh, I found an online calculator that gave me my Q. One filter is 700Hz, 0.99 Q. The other is 500Hz, 0.67 Q. Now, can anyone tell me what value resistors I need to achieve these filters (and gain is something separate, right?)

2nd January 2006, 05:40 AM	#3
JensRasmussen diyAudio Member Join Date: Jul 2002 Location: Denmark - Jutland	I have used a gyrator circuit to build EQ sections in my active filter. You can download the manual here: http://www.delta-audio.com/Active%20filter%20one.htm In the manual you will find the topology and equations to design your own EQ. \Jens

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