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Dc Agar asked I'm using a transformer to switch the voltage down on my generator bicycle lights, so...?
Can I just hook up a double-pole, double-throw switch and cut the circuit to the primary winding? The secondary winding will have to be connected to the other circuit upstream unless I add another switch (that I'll have to remember to flip). Or, should I use a relay switch to sever the secondary winding to avoid a magnetizing current? The lights have way more ohms than that secondary winding. Seems like that secondary winding will suck up all the current. I am making this switch system because I have combined an old-style AC bicycle wheel generator with LED bulbs. The LED bulbs can blow if the voltage goes to high. I have a rectifier and a capacitor, and it's working great except for that exceeding voltage when I pedal fast. Who needs a voltage regulator converting electric to heat? That won't reduce the drag on the generator and give me the LED bang for the buck. A switching regulator? Sounds interesting, and then Radio Shack may have a physical switch beyond a double-pole, double-throw. Maybe a triple pole, double throw. Yup, that's it. Thanks.
And got the following answer:
The use of transformers for this application seems a little elaborate. If you really feel a linear regulator will give you too much drag, then I'd recommend using a switching regulator instead, they can give you efficiencies up to 95%. http://www.mouser.com/Semiconductors/Power-Management-ICs/DC-DC-Switching-Regulators/_/N-668jt/