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RC / RL Filter

Calculate the –3 dB cutoff frequency for passive first-order low-pass or high-pass filters. · in Signal

low passhigh passcutoff

Calculate the –3 dB cutoff frequency for passive first-order low-pass or high-pass filters. Enter R and C (or R and L); get fc, τ and the circuit drawn for the filter type you chose.

RC / RL Filter — RC low-pass cutoff frequency

RC / RL Filter — RL high-pass cutoff frequency

How to use

Two modes — Low-pass / High-pass.

What it's for

Low-pass or high-pass cutoff, with the circuit drawn.

You enter

R and C (or R and L).

You get

Cutoff frequency fc, time constant τ, and the matching circuit drawn for the filter type you chose.

RC / RL Filter

How to use

What it's for

You enter

You get

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Put the formula book down.