RL High-Pass/ Low-Pass Filters

Thread Starter

Petrucciowns

Joined Jun 14, 2009
62
Does anyone know the formula to find the cutoff frequency for an RL High-Pass/ Low-Pass Filter?

I know with RC filters it's 1/ (2ΩRC) ,but this does not work for RL filters.
 

Thread Starter

Petrucciowns

Joined Jun 14, 2009
62
Thanks for the reply. I already tried that one. It calculates the cutoff frequency of and RC filter. The one I listed above calculates the cutoff frequency of an RL filter.
 

Jony130

Joined Feb 17, 2009
5,487
Well, of course the cut-off frequency is when XL=R
XL=ωL=2∏F*L
And the time constant for LR circut is L/R
Therefore, the cut-off frequency, no matter if High-Pass/ Low-Pass
fc = R/(2•Π•L)

 
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