LED Resistor Calculator
LED Resistor Calculator Introduction
1. Principle
The LED Resistor Calculator helps determine the appropriate current-limiting resistor value for LED circuits. The calculation formula:
R = (Vsupply - Vf × N) / If
- Vsupply: Supply voltage
- Vf: LED forward voltage
- N: Number of series LEDs
- If: Forward current (A)
2. Calculation Process
- Input voltage, forward voltage, current, and LED count
- Automatic resistor value calculation
- Power consumption estimation
3. Applicable Scope
- Single or multiple series LED circuits
- Various LED types and colors
- Precision brightness control applications
4. Example
Scenario: 12V supply, 3 red LEDs (2V, 20mA each)
Total Voltage: 2V × 3 = 6V
Resistor: (12V - 6V) / 0.02A = 300Ω
5. Important Notes
- Verify input parameters accuracy
- Use resistors with adequate power rating
- Consider LED color-specific voltages
- Implement current protection measures
Circuit Diagram: Series LED Configuration