All About Circuits Forum RL High-Pass/ Low-Pass Filters
 Register Blogs FAQ Members List Today's Posts Search Today's Posts Mark Forums Read

 Homework Help Stuck on a textbook question or coursework? Cramming for a test and need help understanding something? Post your questions and attempts here and let others help.

#1
06-25-2009, 05:52 AM
 Petrucciowns Member Join Date: Jun 2009 Posts: 62
RL High-Pass/ Low-Pass Filters

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.
#2
06-25-2009, 05:07 PM
 Petrucciowns Member Join Date: Jun 2009 Posts: 62

I figured it out, but if anyone is ever looking for it it's:

Fc (Cutoff frequency) = R/ ( 2ΩL)
#3
06-25-2009, 06:59 PM
 PRS Senior Member Join Date: Aug 2008 Location: Yakima Washington Posts: 989

I believe its f = 1/(2*pi*R*L)
__________________
Paul
Yakima, Washington
#4
06-25-2009, 11:08 PM
 Petrucciowns Member Join Date: Jun 2009 Posts: 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.
#5
06-26-2009, 06:11 PM
 Jony130 Senior Member Join Date: Feb 2009 Location: Poland/Wroclaw Posts: 2,509

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)

 Tags filters, highpass or, lowpass

 Related Site Pages Section Title Worksheet Switched capacitor circuitry Worksheet Active filters Worksheet Signal modulation Worksheet Passive filter circuits Textbook Resonant filters : Filters Textbook Band-stop filters : Filters Video Lecture Op Amp Applications - Active Filters - Op Amps and Op Amp Circuits Textbook High-pass filters : Filters Textbook Low-pass filters : Filters Textbook Q and bandwidth of a resonant circuit : Resonance

 Similar Threads Thread Thread Starter Forum Replies Last Post DaveH General Electronics Chat 8 04-30-2009 05:00 PM skanes 1 Homework Help 3 04-08-2009 10:45 PM Enigmatic Entity The Projects Forum 3 03-05-2009 11:03 PM cptott The Projects Forum 5 12-08-2008 08:35 PM diwa2000@gmail.com General Electronics Chat 2 06-20-2008 02:49 AM

 Thread Tools Display Modes Linear Mode

 Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is Off Forum Rules
 Forum Jump User Control Panel Private Messages Subscriptions Who's Online Search Forums Forums Home Electronics Forums     General Electronics Chat     The Projects Forum     Homework Help     Electronics Resources Software, Microcomputing, and Communications Forums     Programmer's Corner     Embedded Systems and Microcontrollers     Computing and Networks     Radio and Communications Circuits and Projects     The Completed Projects Collection Abstract Forums     Math     Physics     General Science All About Circuits Commmunity Forums     Off-Topic     The Flea Market     Feedback and Suggestions

All times are GMT. The time now is 08:58 PM.