Solar Powered
Will a voltage or current regulator be useful in a solar powered LED circuit?
I want to make a circuit consisting of multiple LEDs that will be solar powered. Will a voltage or current regulator be useful? What else will be useful in the circuit besides resistors?
A VR is useful if you expect greater-than-design voltage at the source - and your circuit is sensitive to over-voltage. Otherwise it is not necessary. For instance if your solar panel will deliver 12V at 1A, and all you need is 6V at 0.5A, you will need a VR (with the proper heat-sink) to control voltage. You could do it with power-resistors, the values for which can also be calculated, but that is a calculation vs. a straight-forward solution.
You can also approximate with resistors and then clamp with a zener to prevent over-voltage.
If you don't have to drop the input voltage, then a VR (or other form of regulation) will not be required.
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