Using an LED resistor calculator can help you determine the appropriate resistance for your LED circuit, ensuring your LEDs operate safely. Here's how to use one effectively.
Inputs
Source Voltage (Vs): The total voltage from your power source, measured in volts.
LED Forward Voltage (Vf): The voltage drop across the LED, which varies by color (e.g., Red = 2V).
LED Forward Current (If): The current flowing through the LED, typically around 20mA.
Number of LEDs in Series: How many LEDs are connected in a series configuration.
Outputs
Resistance (R): The value of the resistor needed, measured in ohms.
Resistor's Wattage (P): The power rating of the resistor, measured in watts.
Why Use a Resistor with LEDs?
LEDs require a specific range of current to operate correctly. Exceeding this range can damage the LED. A resistor in series with the LED helps limit the current to a safe level.
How to Use the Calculator
Input Values: Enter the source voltage (Vs), LED forward voltage (Vf), LED forward current (If), and the number of LEDs in series.
Calculate: The calculator will provide the necessary resistor value (R) and its power rating (P).
LED Forward Voltage by Color
Red: 2V
Green: 2.1V
Blue/White: 3.6V
Yellow: 2.1V
Orange: 2.2V
Amber: 2.1V
Infrared: 1.7V
Calculation Equation
To find the resistor value mathematically, use the equation:
Where:
Vs: Source voltage
Vf: LED forward voltage
If: LED forward current (in amps)
N: Number of LEDs in series
Using an LED resistor calculator simplifies finding the right resistor to ensure your LEDs work safely and efficiently. By inputting your circuit parameters, you can quickly get the necessary resistance value and avoid potential damage to your LEDs.
To use the calculator, visit: LED Resistor Calculator.
No comments:
Post a Comment