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?
Would these be usable?
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
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