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    A simple transistor switch for an LED light.

    Hi all, I want to make a very simple circuit. I have a few components that I have dug out of storage from when I took some electronics courses way back in college. I want to learn some stuff about transistors. The description of the circuit is to use a NPN transistor switch to power an LED...
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    What is a voltage regulator?

    Thanks! Mike
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    Cell Phone "AA" BATTERY Replacement...

    My cell phone battery uses 3.7V. I want to use 2 "AA" batteries (3V) to replace the 3.7V cell phone battery. Does anyone know where I would start to try to design a dc-to-dc converter for this? How important is it to use 3.7V as opposed to a 3V power supply? I'm sorry for the complete newbie...
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