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Old 23rd January 2006, 08:17 PM   #11
APaddy is offline APaddy  United Kingdom
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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???
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Old 24th January 2006, 07:58 AM   #12
Did it Himself
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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, modules and more.
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Old 24th January 2006, 08:06 AM   #13
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This one will give you the schematic diagram and the values. The proposed circuit is inverting however.



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