You want to talk electrics/electronics? Fire away... I did a year of Microelectronic Engineering at uni where that kind of stuff was rammed down our throats. Yes capacitors are good for filtering as are inductors, which is why BOTH of them are found in noise filters. Did you know inductance isn't just measured by the number of turns on the former? The cross-sectional area of the former, diameter of the wire, material the former is made of, length of the coil and shape of the former all have an effect on the inductance. If I was feeling energetic I could draw up a circuit for a noise suppressor but it'd be more trouble than it's worth to construct it because they can be bought so cheaply.
Noise filters are effectively a low-pass filter.
Not meaning to have a go at you or offend you but you came across as thinking you know more than you do.