Filter capacitor

Filter capacitors are any capacitors used for filtering. Filter capacitors are common in electrical and electronic work, and cover a number of applications, such as:

* Glitch removal on dc power rails
* Radio frequency interference (RFI) removal for signal or power lines entering or leaving equipment
* Capacitors used after the reservoir capacitor to further smooth dc power supplies
* capacitors used in audio, IF or RF frequency filters (eg low pass, high pass, notch, etc)
* arc suppression

Filter capacitors are not the same as reservoir capacitors, the tasks the two perform are different, albeit related.