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No
It would involve some electronics work but it could be done. Might add that it could be more expensive than just buying the proper power supply. Use Use 220V 60hz motor to run 110V 50hz Generator.
As the waffle maker is a totally resistive load there will be no problem using the different supply.
you can't
The voltage and frequency range depends on the individual appliance, but each appliance should have a small plaque on it near where the power cord enters, telling you the working range.
Yes, no problem.
220v 50Hz
Nothing happens. The stereo has a transformer that converts the power to DC, and 50 or 60 Hz input makes no difference.
There should be no problem at all.
220V , 50Hz
The compressor may run slightly faster, but little else. You should get away with it without damage. Any timer circuits may be inaccurate.