Active Single Stage Butterworth 3rd order HP Calculator? - diyAudio
 Active Single Stage Butterworth 3rd order HP Calculator?
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 24th January 2007, 03:46 AM #1 HiFiNutNut   diyAudio Member   Join Date: May 2004 Location: Sydney Active Single Stage Butterworth 3rd order HP Calculator? Hi, Where can I find it on the net? Have you got a link? I have found the excellent site http://www.beis.de/Elektronik/Filter/Filter.html by Uwe Beis (thank you Uwe!) but it has only the LP Calculator. I don't know how to convert a 3-pole single stage LP to a HP. Any links or information will be highly appreciated. Thanks. Bill
 24th January 2007, 10:18 AM #2 consort_ee_um   diyAudio Member   Join Date: May 2004 Location: Hertfordshire You can use Uwe 's excellent on-line calculator and then transpose the capacitors to resistors and resistors to capacitors keeping the impedances the same at the cut-ff frequency so for a 50Hz low-pass filter First column is Uwe's calculated values for a 50Hz filter Second column is my transposition using Z=1/2piFC R1 = 5.84k c1 = 545nF r3 = 9.5k c3 = 330nF r5 = 8.5k c5 = 374nF c2 = 680n r2 = 4.7k c4 = 1uF r4 = 3.18k c6 = 100n r6 = 31.8k The second column gives a high pass filter with a cut-off of 50Hz and a slope of 18dB per octave Only problem is that Uwe has chosen the LP capacitors to be standard values and the new values are not standard, although I could not resist rounding r2 to 4.7K and c3 to 330nf.
 24th January 2007, 11:01 PM #3 AndrewT   diyAudio Member   Join Date: Jul 2004 Location: Scottish Borders Hi, Uwe's use of unity gain S&K forces one to adopt quirky values for the capacitors. If one adopts the equal value component S&K then the gain setting resistors can be chosen to make the Q=1 completely independant of the frequency setting components where R1=R2=R and C1=C2=C. Much easier to select suitable capacitor values and by using either a pair of parallel resistors for each R or a series pair for each R to obtain any frequency with standard E24 values. National Semiconductor ap note 779 and oa26 apply. __________________ regards Andrew T. Sent from my desktop computer using a keyboard
 28th January 2007, 09:37 PM #4 HiFiNutNut   diyAudio Member   Join Date: May 2004 Location: Sydney Thanks guys. I have got it.

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