Hello everyone, I have a electric heater in my living room, it has noise when working, the noise is not 50hz(the electric frequency in country I am living), but a much sharper sound, it makes me feel like it's just near my ears. The higher power I set, the loader it will be, although it's not very load even at the highest power, but it's really annoying to hear it all day, the heater uses resistance wire so I don't even know how it makes the noise, but I think maybe I can solve the problem by giving it DC instead of AC, so I plan to use 4 diodes to make a rectifier bridge, then use 2 capacitors as filter, can anyone help me to decide the specification of the capacitors? The utility power is 220 volts, 50HZ, and my electric heater is 2200 watts. Thank you for any help!