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Takes 120 VAC 60hz and converts it to 5v DC
It's a bit above 5 volts, but just slap a regulator on it, and up the transformer ratio if you need better precision.
This uses a transformer, a full bridge rectifier, an inductor, a capacitor, a zener diode and a resistor (acting as the load).
First voltage is stepped down through the transformer. It then gets rectified by the full bridge rectifier. It then goes through the coil (For current stability), then goes through the capacitor, getting rid of the humps of the rectified DC. It then goes through a zener diode for greater accuracy and then through your load (the resistor)
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