Some good values to try: As supply voltage: For molex: 5, 7 and 12 volts. Batteries: and 9 volts. As led forward voltages: Red and green: 2 volts. Blue and. To calculate the current limiting resistor, you first need to look in the datasheet ( always RTFM first!) for the LED's recommended forward voltage. DigiKey's LED series resistor calculator uses supply voltage, forward voltage, and forward current values to help you identify the correct series resistor.

An LED resistance calculator is perfect for when you have a single LED and Thus, limiting the current through the LED with the use of a series resistor is a. Calculate resistor values for LEDs using this simple calculator. The current through the circuit is constant so ILED is also the current through the resistor. The LED series/parallel array wizard is a calculator that will help you design large The wizard determines the current limiting resistor value for each portion of.

This is the new version of the single LED series resistance calculator, good for when you have a single LED and LED calculator: current limiting resistor value. LED Current Limiting Resistor Calculator: Identify series resistor based on supply voltage, forward voltage, current requirements and number of LEDs. When computing the value of a current limiting resistor for a single LED, the calculate the current draw of the circuit and the necessary power dissipation of the. LED Resistor Calculator. Current is usualy 20mA, for UFO LEDs current is: 30mA for InGaN and 50mA for AlGaInP. Calculated Limiting Resistor OHMS.