Current limiting resistor calculator
v1.5 03.10.2006 Led GURU launched! v1.4 25.08.2006 Current limit upped to 2000mA to support Luxeon and other high power leds. v1.3 09.06.2006 New graphics + help options v1.2 21.03.2006 Resistor color codes added v1.1 31.05.2003 Opera support v1.0 08.05.2003 Initial release Some good values to try:As supply voltage: For molex: 5, 7 and 12 volts Batteries: 1.5 and 9 volts As led forward voltages: Red and green: 2 volts Blue and white: 3.5 - 4 volts Led current: 20mA will work for most leds. |

## .:Single led | |

Calculated Limiting Resistor
OHMS
Nearest higher rated 10% resistor
Calculated Resistor Wattage
WATTS
Safe pick is a resistor with power rating of
WATTS |

## .:Leds in series | |

Calculated Limiting Resistor
OHMS
Nearest higher rated 10% resistor
Calculated Resistor Wattage
WATTS
Safe pick is a resistor with power rating of
WATTS |

## .:Leds in parallel | |

Calculated Limiting Resistor
OHMS
Nearest higher rated 10% resistor
Calculated Resistor Wattage
WATTS
Safe pick is a resistor with power rating of
WATTS |

You can find the new and improved GURU at http://www.ledcalc.com/ !

## .:GURU | |

Calculated Limiting Resistor R1
OHMS
Nearest higher rated 10% resistor
Calculated Resistor Wattage
WATTS
Safe pick is a resistor with power rating of
WATTS
Calculated Limiting Resistor R2
OHMS
Nearest higher rated 10% resistor
Calculated Resistor Wattage
WATTS
Safe pick is a resistor with power rating of
WATTS |