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Re: Power supply question
Here is a web page with the circuit diagram that you'll need.
Maximum input voltage should absolutely be no more than 35V dc.
Re: Starting Out
Is the "lamp" to be powered from the USB connector, or is it merely controlled by the USB?
Is the "lamp" an incandescent light bulb (or fluorescent bulb), and if so do you know the voltage and current requirements? Or do you mean 1-4 average LEDs?
USB powered devices are...
I don't know of any latch-up problems with voltage regulators.
As far as the pin-out of the voltage regulator, it depends on which packaging you are referring to.
The TO-220 for a National **broken link removed** is GND, IN, OUT left-to-right, when the text is facing you (not the metal tab)...
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