#### The simple R-C **filter** rolls off the **frequency** response at 6 dB per octave above the **cutoff** **frequency**. The position of the resistor and capacitor are switched to change from low **pass** to **high** **pass** but the same calculation applies to both **filters**. This **calculator** assumes a low source impedance, which usually is small enough that it does not change. The **high pass filter** capacitor **calculator** can be used to **calculate** the value of resistor needed to create a **filter** with a specific **cut-off frequency**. It requires two inputs: (1) the desired **cut-off frequency**, and (2) the capacitance of C 1. Answer (1 of 2): basically it is the point in the **filter** spectrum where the **filter** transitions from passband to stopband. It is defined in **frequency** - Hz or radians per second. Usually it is the point where the response is down by 3dB. On one side you will have near 0.

**Cutoff Frequency**: A simple Low

**pass**RC circuit consists of a resistor and capacitor across the input and capacitor across the output. It is the -3dB point of the

**filter**. If you want to build your

**filter**using. In a low-

**pass**RC

**filter**having a

**cutoff frequency**of 2khz, C=80nf. Sc Elecrical Engineering Electrical Engineering, CECOS.

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