In conventional power supplies, the mains is rectified (that means the negative parts of the main cycle are flipped over to become positive). This gives 50 or 60 positive pulses per second. These pulses are used to charge up capacitors that store the charge between top ups. If you put a scope on the capacitor, you will see a sawtooth waveform that shows the top of the pulse, then the voltage diminishing as the current is drawn by the unit.
GoHz solid state frequency converters provide 60Hz to 50 Hz frequency conversion for export manufacturers who wish to simulate the power provided in factories overseas. These 60 Hz to 50 Hz frequency converter can also be used to power 50 Hz equipment that has been imported from overseas and needs to run from the 60 Hz power grid found in American manufacturing facilities. The output frequency is 50 Hz (+/-1.5%). GoHz.com offers 50Hz to 60Hz frequency converter in capacities ranging from 500 VA to 300 KVA and they can be shipped in custom sound-resistant or weather-resistant enclosures.
If the PSU is a wallwart, it might have only the transformer in it. Or it might have the rectifier and capacitors as well. Or it might even have a voltage stabiliser in it that removes the sawtooth ripple before it gets into the following gear.
Two different problems can arise in changing from 60Hz to 50Hz.
- The number of pulses per second decreases. If the gear draws constant current, then the transformer must deliver more current on each 50Hz pulse than it would at 60Hz. Under-rated transformers can get hot coping with this. You can tell but measuring the temperature on the transformer if you are going to get a problem. Your finger should do. But don't kill yourself in the process by touching the mains power terminals.
- On the capacitor, the voltage dip will get deeper at the bottom of each cycle, since current is flowing out of it for longer. This increases the ripple. The result can be that it becomes more audible. Your ears can test for that.
The capacitor can get stressed. You nose will tell you that one, though your finger might give a warning. There might also be a resistor in the way somewhere that gets a bit warmer than designed for.
The stabilising circuit that follows might find that the voltage coming in drops below the voltage planned to go out. So ripple appears on the output of the stabilised supply. While this won't usually break the gear, the resulting noise might want to make you bin it.