Still, plugged into the wall power sounds more dangerous than a 9-volt battery don't you think?
Have you tried the Hulda Clark style zapper? It works pretty well. Any frequency, as long as it is a pulse instead of an oscillation, gets all types of parasites. The only weakness is some areas of the body (the insides of intestines, eyes, bones) are electrically shielded. The cheapest site is $10 at zapperplans.com, for a very compact unit.