Help designing a RC passive high pass filter

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Homework Help Overview

The discussion revolves around designing a passive RC high pass filter with a specified cutoff frequency of 3 kHz. Participants are exploring the application of the formula for cutoff frequency and the selection of component values.

Discussion Character

  • Exploratory, Conceptual clarification, Problem interpretation

Approaches and Questions Raised

  • The original poster attempts to apply the cutoff frequency formula but expresses uncertainty about the next steps, particularly regarding component value selection. Some participants question whether additional factors, such as impedances and voltages, should be considered. Others suggest choosing a capacitor value first and calculating the corresponding resistor. A participant raises a question about the units for resistance and capacitance in the formula.

Discussion Status

The discussion is active with participants providing guidance on component selection and raising relevant questions about the formula's application. There is no explicit consensus, but various interpretations and approaches are being explored.

Contextual Notes

Participants are discussing the constraints of component values and the need for clarity on units used in the formula. There is mention of standard ranges for electronic components, which may influence the design choices.

bengaltiger14
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Homework Statement



I was asked to desing a RC passive high pass fiilter with a cutoff of 3KhZ.

Homework Equations


The formula for Fc = 1/(2piRC)


The Attempt at a Solution



I set 3kHz = (1/(2piRC)) but am not sure what to do next. Do I pick a random cap or resistor value and solve?
 
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Is that it? Nothing else, no mention of impedances, voltages, anything?
 
Since resistors cover a larger range of commercial values, you should pick a reasonable value for the capacitor and calculate the corresponding resistor.
 
Look up the standard ranges for electronic components, E12, E24 etc...
 
Sorry to dig up a really old thread... I found this site via Google.

I want to use this formula:

Fc = 1/(2piRC)

to determine the corner frequency of a passive 'tone control' circuit as commonly used in electric guitars (a low-voltage AC circuit).

What I don't know about the formula is what the proper units are for R and C.

Is R in ohms? Thousand ohms?

Is C in farads? Microfarads?

An example would be a very common one:

A 500k ohm potentiometer, and a .022uf capacitor.

Plugging the numbers into a the formula isn't a problem - I just don't know what the units are supposed to be...
 

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