Hi to all, I want to use a 60 hz vacuum cleaner on a 400hz power source, can anyone advise me of a circuit that can achieve this. My reason for asking is that a relative of mine purchased a 60 hz unit for the company she works for without knowing the difference in frequency,and she is in a a bit of difficulty with her boss, I would be happy if anyone can advise on a way forward. Thanks for your assistance, alim.