Variable (Freq. and Voltage) AC Power Supply
If I understood correctly, you need a 280W power amplifier, which can be a little costly. And if you want precise sinusoidal waveform in the output, you will need a Class A one. They waste heat a lot, so the actual wattage &amp; current will be higher. Not all environments may be suitable for this experiment, because most fuses in single phase powered areas will open in 16 Amps. If none of these are problem for you, go ahead.