Dial these in, plug in your LED, and the tiny electronic brain inside figures out the resistor value that you ... Set an LM317 circuit up to output 10mA, say, and you can safely test out about ...

This flashlight is just that – a simple switch to turn the LEDs on and off, a button, and from the looks of things, not even a single current limiting resistor ... circuit and none of the ...

Using properties of a series circuit, the sum of the voltages across the LED and resistor R must equal the supply voltage. \({V_s} = {V_{LED}} + {V_R}\) Now substitute the supply voltage (\(6V ...