Enter the feedback resistance, feedback capacitance, and the number of RC feedback stages into the calculator to determine the oscillator frequency.

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## Oscillator Frequency Formula

The following formula is used to calculate the frequency of an RC oscillator.

f = 1 / [ 2*pi*R*C*Sqrt(2*N) ]

- Where f is the frequency (hertz)
- R is the feedback resistance (ohms)
- C is the feedback capacitance (Farads)
- N is the number of feedback states

## Oscillator Frequency Definition

**What is an oscillator frequency? **An oscillator frequency is typically used to describe the frequency in hertz that an RC or RLC oscillator resonates at.

## Example Problem

How to calculate an oscillator frequency?

**Fist, determine the feedback resistance.**For this example, we are looking at a simple RC oscillator with a feedback resistance of 20 ohms.

**Next, determine the feedback capacitance.**The feedback capacitance of the same oscillator is found to be 35 Farads.

**Next, determine the number of feedback stages.**In this example, the oscillator has 3 feedback stages.

**Finally, calculate the frequency.**Using the formula above, the oscillator frequency is found be:

1/ [2*3.14159*20*35*SQRT(2*3) ] = 0.000129 hertz.