An RC network, or RC circuit, is a resistor-capacitor circuit device used to filter a signal by blocking certain frequencies and allowing others to pass. RC circuits can also be used to minimize the chance of arcing, and reduce noise in relay and switching applications.
RC networks consist of a combination of resistors and capacitors connected in series, the simplest being one resistor and one capacitor. The arrangement of the resistor and capacitor in the circuit determines the output of the device and gives the RC network its primary operating characteristic.
The most common RC networks are high-pass filters and low-pass filters. High-pass filters attenuate low frequency signals and protect sensitive circuits from direct current. Low-pass filters attenuate high frequency signals and smooth or remove short-term fluctuations.