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 2nd September 2005, 10:00 AM #1 Craig405   diyAudio Member     Join Date: Jul 2005 Location: Sussex 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
 2nd September 2005, 03:39 PM #2 eLarson   diyAudio Member     Join Date: Aug 2002 Location: Gaithersburg, MD 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. __________________ Would a woodchuck bother to chuck MDF?
 2nd September 2005, 04:40 PM #3 Craig405   diyAudio Member     Join Date: Jul 2005 Location: Sussex 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
 2nd September 2005, 05:48 PM #4 edl   diyAudio Member     Join Date: Oct 2004 Have you downloaded this nice program yet? http://www.duncanamps.com/tsc/ Works very good, easy to handle.
 2nd September 2005, 06:51 PM #5 eLarson   diyAudio Member     Join Date: Aug 2002 Location: Gaithersburg, MD Glad it helps. __________________ Would a woodchuck bother to chuck MDF?
 3rd September 2005, 11:04 AM #6 Craig405   diyAudio Member     Join Date: Jul 2005 Location: Sussex 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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