pcb

Computes the cutoff frequency, time constant, impedance, and phase shift of a first-order RC filter. Supports both lowpass and highpass topologies. The cutoff frequency is f = 1/(2*pi*R*C) where the signal is attenuated by 3 dB. The time constant tau = R*C governs transient response — the capacitor reaches 63.2% of its final value after one tau. Use for anti-aliasing before ADCs, DC blocking, noise filtering, and signal conditioning. Chain from voltage_divider to design filtered bias networks.

post/api/rc_filter

Request

  • Base URL: https://calc.engineer
  • URL: https://calc.engineer/api/rc_filter
  • Auth: none declared

Request body

resistance_ohmnumber required

Resistance in ohms (R). The resistive element of the RC filter.

capacitance_fnumber required

Capacitance in farads (C). The capacitive element of the RC filter.

filter_type'lowpass' | 'highpass'

Filter topology: 'lowpass' (R then C to ground) or 'highpass' (C then R to ground).

Response

Computed result for rc_filter

toolstring required
versionstring required
computed_atstring date-time required

Changes

No recorded changes to this operation across all 1 revision of this API.