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previous: Bill Could someone tell me (again) how t... -- 7/11/2000 2:52 AM

Re: RC Filters

7/11/2000 4:25 AM
R.G.	Re: RC Filters In the words of the early Texas settlers, the Lord giveth, and the Lord taketh away. There are a number of other places with that particular bit of knowledge, fortunately. But it's easy enough I never can remember that I need to write it down. A resistor and capacitor are halfway to whatever they will do - highpass or lowpass - when the capacitive reactance equals the resistor. That is, when Xc = 1/(2piFrequency)= R, the filter is at its knee. So with a little elementary algebra, Freq. = 1/(2piR*C).

7/11/2000 4:25 AM

R.G.

Re: RC Filters

In the words of the early Texas settlers, the Lord giveth, and the Lord taketh away. There are a number of other places with that particular bit of knowledge, fortunately.

But it's easy enough I never can remember that I need to write it down. A resistor and capacitor are halfway to whatever they will do - highpass or lowpass - when the capacitive reactance equals the resistor. That is, when Xc = 1/(2*pi*Frequency)= R, the filter is at its knee. So with a little elementary algebra, Freq. = 1/(2*pi*R*C).

Replies:

Bill Thanks RG. You helped me on this on... -- 7/11/2000 12:35 PM
Bill One last question on this subject. ... -- 7/11/2000 2:27 PM
Bill I'm sorry. That's F and Kohms.... -- 7/11/2000 2:31 PM