Help designing a RC passive high pass filter

AI Thread Summary
To design an RC passive high pass filter with a cutoff frequency of 3 kHz, the formula Fc = 1/(2πRC) is used. The discussion highlights the importance of selecting appropriate resistor and capacitor values, with a recommendation to choose a reasonable capacitor value and calculate the corresponding resistor based on standard ranges like E12 or E24. Clarification is sought regarding the units for resistance (ohms) and capacitance (farads or microfarads). An example is provided using a 500k ohm potentiometer and a 0.022 µF capacitor to illustrate the application of the formula. Understanding the correct units is essential for accurate calculations in circuit design.
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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