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Help designing a RC passive high pass filter

  • #1

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?
 

Answers and Replies

  • #2
960
0
Is that it? Nothing else, no mention of impedances, voltages, anything?
 
  • #3
SGT
Since resistors cover a larger range of commercial values, you should pick a reasonable value for the capacitor and calculate the corresponding resistor.
 
  • #4
194
0
Look up the standard ranges for electronic components, E12, E24 etc...
 
  • #5
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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