DigiKey's LED series resistor calculator uses supply voltage, forward voltage, and forward current values to help you identify the correct series resistor.

Choosing a suitable resistor to connect in series with an LED is fairly simple, it just requires some knowledge of the I-V characteristics of the LED being used, and some basic maths using …

Such a resistor is often called a ballast resistor. The ballast resistor is used to limit the current through the LED and to prevent excess current that can burn out the LED. If the voltage …

LED resistor calculator: learn to choose the right resistor for any LED, understand forward voltage, measure Vf, and apply Ohm’s Law for series and parallel circuits.

Oct 27, 2025 · An LED resistor is a current-limiting resistor placed in series with an LED. Its job is simple but critical: it limits the amount of electrical current passing through the LED so that it …

Use our free LED resistor calculator to find the perfect resistor for your LED circuit. Get accurate values for single LEDs, multiple LEDs, and different power sources.

May 9, 2025 · Use our LED resistor calculator and guide to design safe and efficient LED circuits. Includes formula, charts, examples, and a video tutorial.

An LED (Light Emitting Diode) requires a current-limiting resistor to prevent damage and ensure proper operation. This calculator helps you determine the correct resistor value based on your …

When a resistor is connected in series with an LED in a circuit to protect the light-emitting diode by restricting the flow of current through them is known as an LED resistor.

LED Resistor Calculator: Calculate accurate resistor values and power ratings for your LED circuits. Enter source voltage, LED voltage, and LED current for fast, precise results.