I have an amplification circuit where I am essentially reading a somewhat deformed square wave and I am having a lot of trouble with 60Hz noise from the walls being superimposed on my signal. The signal of interest goes from 5v - 0v, has a period of about 60ms, and I need it to be relatively unaffected by any filtering. I've tried low pass filters and while they get rid of the 60Hz they also attenuate my signal. Notch and bandpass filters just seem to differentiate my signal or completely distort it. Is there a good (preferably simple) way of removing this 60Hz that I haven't tried? I'm not an EE and only know the very basics of circuit design and unfortunately this problem seems to be over my head.