Online calculator for R-C parallel circuits?

[midwayfair]

I use this site a lot for calculating tone circuits: http://sim.okawa-denshi.jp/en/CRlowkeisan.htm

I'm looking for something that will aid my math-challenged brain in calculating this:

   |---R----|
---|           |------
   |---C----|

Especially in a feedback loop of an op amp.

[R.G.]

The frequency for one resistor, one capacitor does not matter whether it's series or parallel. It's always

F = 1/(2*pi*R*C)

The arrangement of the R and C in series or parallel change it from a high pass to a low pass.

Note that if there are other resistances driving or loading the single R and single C, then they can have an effect on the frequency. They are really part of the "R", they just don't show up in the schematic.

[midwayfair]

RG, thank you as always.

[amptramp]

The online calculator is here:

http://www.muzique.com/schem/filter.htm