Quote:
Originally Posted by basslover911
And so something like this? (wireless inductance?)
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Yup, that is how the toothbrushes do it too. Now you need to make it a "step down" transformer if you want "safe" voltage levels in your aquarium, still I wouldn't deliberately expose any circuits, as the exposed circuits will become electrodes and "dissolve". I don't think the glass cares much about magnetic flux, it won't be the worlds most efficient transformer but if it is low power then no biggie.