Finding the Cutoff Frequency for RL High-Pass/Low-Pass Filters

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Discussion Overview

The discussion centers around finding the cutoff frequency for RL high-pass and low-pass filters, comparing it to the known formula for RC filters. Participants explore the correct formula and address formatting issues related to symbols.

Discussion Character

  • Technical explanation, Debate/contested

Main Points Raised

  • One participant inquires about the formula for the cutoff frequency of RL filters, noting that the RC filter formula does not apply.
  • Another participant proposes a formula for the cutoff frequency as Fc = R / (2πL).
  • A different participant presents a similar formula but uses the notation Fc = R / (2ΩL), indicating a potential formatting issue with the pi symbol.
  • One participant provides a solution for displaying the pi symbol correctly in text.
  • A later reply acknowledges the formatting issue has been resolved.

Areas of Agreement / Disagreement

There is no consensus on the correct notation for the formula, as participants present slightly different versions. The discussion remains unresolved regarding the preferred representation of the cutoff frequency formula.

Contextual Notes

Participants have not clarified the assumptions or contexts in which the proposed formulas apply, and there may be ambiguity in the use of symbols.

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

Fc (Cutoff frequency) = R/ ( 2π L)
 
Last edited:
Petrucciowns said:
I figured it out, but if anyone is ever looking for it it's:

Fc (Cutoff frequency) = R/ ( 2ΩL)

Your PI symbol is coming out as an Omega...
 
FYI, if you copy-and-paste the text on the right below, you'll get a nice looking pi symbol:

π . ← . [noparse]π[/noparse]
 
That's weird, but it's all fixed. Thanks for pointing it out.
 

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