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Another disadvantage to this design is high sensitivity to line frequency changes. They also produce a lot of heat while operating and they are heavy. Finally, although very stable theAnother disadvantage to this design is high sensitivity to line frequency changes. They also produce a lot of heat while operating and they are heavy. Finally, although very stable the Ferroresonant Power Supply is not as precisely regulated as in the switched mode or series regulated power supplies, but the output voltages are precise and constant enough for many applications.