well the thing I designed wouldn't be a true EMp, in the effect that it is not a pulse, what it is, is basicly a high voltage short daration ion/magnetic beam, it is directed by low voltage magnets that confines the ion beam for so far a range of about 5 feet (im not using very efficant electromagnets), but it has been able to disrupt small electronic things like clocks and cd players, I must say, it does have an effect on humans though, it gives me a scary tingling feeling every time I try to charge it, of corse ive only tested it 5 times, those telisla coils burn out very easily (expecially if they are home made, not teh best quality lol)
btw, it really heats up the basement