3rd order HIgh pass filter - explanation? - Page 2

APaddy · 23rd January 2006, 08:17 PM

ahhh thanks

but i need the manual calculations to work out how i got a 1khz cut off frequency and how i got 18db per octave and a 3rd order from a high pass filter

help anyone???

richie00boy · 24th January 2006, 07:58 AM

What level of study are you at? If you want the calculations for why it's 3rd-order you are looking at A-Level+ maths calculus.

However, if you just want formula for calculating cut-off frequency and Q then it's a lot easier. Have you got a library you can go to and see if they have The Active Filter Cookbook by Don Lancaster?

phase_accurate · 24th January 2006, 08:06 AM

This one will give you the schematic diagram and the values. The proposed circuit is inverting however.

http://www.analog.com/Analog_Root/st...er/filter.html

Regards

Charles

24th January 2006, 07:58 AM	#12
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	What level of study are you at? If you want the calculations for why it's 3rd-order you are looking at A-Level+ maths calculus. However, if you just want formula for calculating cut-off frequency and Q then it's a lot easier. Have you got a library you can go to and see if they have The Active Filter Cookbook by Don Lancaster? __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

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23rd January 2006, 08:17 PM	#11
APaddy diyAudio Member Join Date: Jan 2006 Location: London	ahhh thanks but i need the manual calculations to work out how i got a 1khz cut off frequency and how i got 18db per octave and a 3rd order from a high pass filter help anyone???

24th January 2006, 08:06 AM	#13
phase_accurate diyAudio Member Join Date: May 2002 Location: Switzerland	This one will give you the schematic diagram and the values. The proposed circuit is inverting however. http://www.analog.com/Analog_Root/st...er/filter.html Regards Charles

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