462Views1Replies

Author Options:

I'd like to build a 3rd order low pass filter, cutoff ~40mhz, impedence at 28mhz of 50Ohms? Answered

Hello All. I want to build a 3rd order low pass filter with a cutoff ~40mhz. I'd like to build this in a metal box seperated into two compartments with a pi filter in each. What components do I need? The input output impedence should be ~50 ohms at 28mhz. It stray capacitence a problem? Thanks?

1 Replies

user
sound91 (author)2009-04-01

I know the general idea of how to do this, but I don't know the exact values of the components you need. The book you need is Lancaster's Active Filter Cookbook. It explains all of the math for filters and the different types.

Select as Best AnswerUndo Best Answer