Between thunderous stadium cheers and blaring party speakers, the energy of game day can put your ears at risk.

In its raw form, the Twin T filter is fairly useful for killing a specific nuisance frequency in a signal. Maybe you want to knock out power line noise (60Hz in the USA, 50Hz in Europe).

But if you are working on something meatier, handling electrical noise gracefully is important and simulation can help you. [Ignacio de Mendizábal] has a great piece on simulating EMC filters ...