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LED Resistor Calculator

LED Strip Resistor Calculator Guide

📖 Overview

This calculator determines the optimal resistor value for LED strips based on:

  • LED density (lights/meter)
  • Input voltage (DC12V/24V)
  • Power consumption (W/m)
  • Forward voltage (Vf) per LED

📝 Step-by-Step Guide

1

Enter Parameters

  • LEDs/m: Total LEDs per meter
  • Voltage: Select DC12V or DC24V
  • Power: Power consumption per meter
  • Vf: Forward voltage (Default: 3.0V)
2

Click Calculate

The tool will automatically:

  • Verify input validity
  • Calculate circuit groups
  • Determine current requirements
  • Compute resistor values

⚡ Core Calculation Logic

1. Group Formation:
12V: 3 LEDs + 1 resistor per group
24V: 6 LEDs + 1 or 2 resistors

2. Current Calculation:
Igroup = (Power / Voltage) / Groups

3. Resistor Voltage:
Vresistor = Vinput - (LEDsper group × Vf)

4. Resistance Value:
R = Vresistor / Igroup

🔧 24V Configuration Options

Configuration Resistors Calculation Benefits
Standard 1 resistor R = Calculated value Simpler layout
Alternative 2 resistors Reach = Rtotal / 2 Better heat distribution

⚠ Important Notes

  • Actual Vf varies with current (±5% tolerance recommended)
  • Always verify with physical measurements
  • Resistor power rating should exceed calculated value
  • For production solutions: [email protected]

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