10 V power supply and 1 kΩ resistor, what is the current flowing through the LED?

IntroductionIn a circuit that lights up an LED, it is standard to connect a resistor in series with the LED. So, if the power supply voltage is 10 V and the resistor is 1 kΩ, how many mA of current ...
Hackaday

LED Tester Also Calculates Resistor For Target Voltage

[mircemk] built a slick-looking LED tester with a couple handy functions built in. Not only can one select a target current to put through an LED, but by providing a target voltage, the system will ...
EDN

Current Limiting Resistors for LEDs

One of the questions that hobbyists ask over and over is how to select the value of a current limiting resistor for an LED. Usually the seat of the pants response is: “Subtract 2 V from the supply ...
EDN

Rotary Encoder for LED Calculator

The project is originally designed as LED calculator but the addition of a rotary encoder to set the target system voltage results to adjusting the LED brightness using the potentiometer. By turning ...