Caps/Inductors for a Filter

hammdawg · 12th November 2007, 10:30 PM

Hey I'm new at this stuff, but I was wondering if there was any recommendations for Caps and inductors to use in an Hi-fi audio filter. I am going to be making a 2nd order Butterworth filter.

The general consensus from what I have read is that polypropylene cap's are the way to go, and either air core or powder core inductors. What are the advantages /disadvantages for the inductors. Also what is the ideal way for choosing which cap value to use?

Thanks

Original Burnedfingers · 12th November 2007, 11:15 PM

Would these be usable?

gootee · 13th November 2007, 06:51 PM

If you only need small cap values, also consider using polystyrene.

I usually have to choose cap and inductor values based at least partially on what's available that has the specs I need, and at what cost and size penalties. Often, for filters, the C and L values will have an inverse type of relationship. You will want to design the filter so that the C and L values fall within practical ranges of values, for the types you want to use.

- Tom Gootee

http://www.fullnet.com/~tomg/index.html

12th November 2007, 10:30 PM	#1
hammdawg diyAudio Member Join Date: Nov 2007	Caps/Inductors for a Filter Hey I'm new at this stuff, but I was wondering if there was any recommendations for Caps and inductors to use in an Hi-fi audio filter. I am going to be making a 2nd order Butterworth filter. The general consensus from what I have read is that polypropylene cap's are the way to go, and either air core or powder core inductors. What are the advantages /disadvantages for the inductors. Also what is the ideal way for choosing which cap value to use? Thanks

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13th November 2007, 06:51 PM	#3
gootee diyAudio Member Join Date: Nov 2006 Location: Indiana Blog Entries: 1	If you only need small cap values, also consider using polystyrene. I usually have to choose cap and inductor values based at least partially on what's available that has the specs I need, and at what cost and size penalties. Often, for filters, the C and L values will have an inverse type of relationship. You will want to design the filter so that the C and L values fall within practical ranges of values, for the types you want to use. - Tom Gootee http://www.fullnet.com/~tomg/index.html

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