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Old 2nd September 2005, 09:00 AM   #1
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Default DIY Baxandall network

Hi,

Here is an excellent website on designing a baxandall filter:

http://www.schmarder.com/radios/tech/tone.htm

However if you read a couple of equations into the page the letter 's' is substituted for Laplace's variable.
I have looked at laplace's variable on this site:

http://mathworld.wolfram.com/LaplacesEquation.html

But i dont know how to apply it to make the equations work?

Can anyone offer some guidance, a few pokes in the right direction even?

Cheers
Craig
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Old 2nd September 2005, 02:39 PM   #2
eLarson is offline eLarson  United States
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substitute 2*pi*f (frequency, in Hertz) for s and you should be able to move ahead.

If you are concerned with phase, also, you can substitute j*2*pi*f.

j is defined equal to the square-root of -1. Essentially it represents a 90 degree phase angle, where -1 would equal a full 180 degree phase angle.

Without taking everyone through a 2nd or 3rd year Electrical Engineering course, that is as short a summary as I can muster.
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Old 2nd September 2005, 03:40 PM   #3
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Hi Elarson

Thankyou for your help, that makes the equations much easier!

I have done some maths involving the j operator and Argand diagrams so should be able to determine the phase angles at various frequencies.

Although theres not a lot i can do about phase shift anyway

Thanks
Craig
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Old 2nd September 2005, 04:48 PM   #4
edl is offline edl  Hungary
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Have you downloaded this nice program yet?
http://www.duncanamps.com/tsc/

Works very good, easy to handle.
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Old 2nd September 2005, 05:51 PM   #5
eLarson is offline eLarson  United States
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Glad it helps.
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Old 3rd September 2005, 10:04 AM   #6
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edl, yes i have it is a really useful program, shame you cant be lazy and just drag the response curves you want and have it calculate the values

Thanks again
Craig
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