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Describe physically what you want to do.
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That's kinda what I was trying to avoid, in order to make it as general as possible. Let's assume this is not a stereo project (though I'm not sure how that would change the problem at all) Use the following as a hypothetical example:
Assume the power source is generated by a human who has nothing better to do with his day then move a magnet through a coil of wire. Basic induction principles tell us that this will generate an alternating electric current. Now, also in the room with the human is a light bulb and a drawer full of electric razors. The light bulb needs a certain amount of current ( / power / wattage? here is the jargon issue) to be on at its appropriate strength, and it must be on all the time because the room has no windows and would be dark otherwise. Also, at any given point in the day, an arbitrary number of hairy men will come in and use the electric razors to shave and leave as less hairy. The electric razors will also require an appropriate amount of current/power to run, but the amount required changes because the load changes. Hence the issue I first posted. I want to split the current/power produced by the source so that the light bulb can be on all the time, and all the excess can go to running the electric razors.
This is obviously an absurd example but demonstrates the kind of problem that I'm getting at. As I said, this was a theoretical question, so I don't want to present too specific a situation because I'm looking for the underlying principle.