This calculator determines that for you. The wizard determines the current limiting resistor value . Some good values to try: As supply voltage: For molex: and volts. As led forward voltages: Red and green: volts. Led current: 20mA will work for most regular leds. Superbright leds can go from 30mA up to several amps.

Voltage drop is usually 1. Current is usualy 20mA, for UFO LEDs current is: 30mA for InGaN and 50mA for AlGaInP. Going beyond that maximum current, even briefly, will damage the LED. Note that this method is not recommended for high current . When we use LEDs in circuits we always use a series resistor. You can also watch this video where Kevin explains why we always use a series resistor , and explains how to calculate the value of the resistor. The easiest way is to use one of the online calculators provided below.

Use the calculator below to determine the series resistor needed to connect various series combinations of light emitting diodes or LEDs. Blue and white LEDs will require higher voltages with blue being about 3. Single led with single resistor. Nearest higher rated resistor. Safe pick is a resistor with power rating of. And indeed there are such things out there — even we have one ( well, a printable papercraft version) — so why bother working through all this?

Calculated Resistor Wattage WATTS. Use this LED resistor calculator to find out the suitable resistance for your LED circuit consisting one or more LEDs. Resistors for LEDs can be used in series and parallel circuits. Online calculator for calculating a current limiting resistor for LEDs. An online calculator to determine resistor needed with an LED.

Oznium LED resistor calculator determines the resistance and power rating. This LED resistor calculator calculates the value of the resistor which you would need in order to produce the desired current to go through the LED. The factors that determine the resistance value of the resistor are the supply voltage, VS, the forward voltage drop needed for the LE VF, and the desired current wanted to . This tutorial article describes how to use LEDs in electronics circuits, and how to calculate the current limiting resistor , and relates other useful hints on using LEDs. Small incandescent lights, such as as flashlight bulbs may be directly . Arduino, Arduino Shields, Arduino sensors, and Arduino Kits.

This should only be used if the LED forward voltage and current are not known. The second calculator gives a more accurate value using these figures, which can be found in the suppliers catalogue.