Can anyone suggest some ways to efficiently regulate the power from a 1.2 NiMH battery to be ~1.0v? The battery powers a small motor and the current is only about 40uA. This is for a marathon type experiment. I considered a couple resistors to make a voltage divider, but as the battery runs down the “divided” voltage will drop proportionally and motor will stall – plus the resistors are inefficient. I really need to REGULATE rather than LIMIT the voltage because as the battery begins to drop voltage, I would like to maintain the 1v source as long as possible. Maybe some type of Zener or regular diode with super low breakdown voltage? Thanks for your help!