LED Calculators
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06/03/2014
Earthmen Productions
Earthmen Productions
Dec-00-Jun-14

 

 

 

 

Home | Up | Mini-Flash Flasher | Mini-Beacon Flasher | Maxi-Flash | Easy-Flash | Pro-Flash Flasher | LED Assembly | LED Calculators
Updated: June 03, 2014

LED CURRENT-LIMITING RESISTORS
Use these calculators to easily determine the correct current-limiting resistor values for driving LEDs...

Single LEDs

Series LEDs

Parallel LEDs

Other Calculators

Other Notes

F.A.Q.

Note: All pictures that follow are "clickable".  Clicking on them will show you an enlargement!


Below are a few neat Javascript calculators that calculates the proper resistor value needed for the current limiting resistor used when powering LEDs. You will need to know some specs of the LED you are using (forward voltage, LED driving current), including the supply voltage you plan to drive the LED with.  Enter these in the spaces below then hit "Calculate Resistor Value" to determine the proper resistor value. The power (wattage) draw by the LED will also be calculated for you.
 

Total LEDs
(in series)
LED Forward Voltage
Maximum LED Current (mA)
Supply Voltage
Calculated Series Resistor

 

MORE LED RESISTOR CALCULATORS

Single LED



Supply Voltage
  VOLTS
Voltage Drop Across LED (Forward V)
  VOLTS
Maximum LED Current
  MILLIAMPS



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


horizontal rule


LEDs in series



Supply Voltage
  VOLTS
Voltage Drop Across LED (Forward V)
  VOLTS
Maximum LED Current
  MILLIAMPS
# of LEDs connected in series
    LEDs



Calculated Limiting Resistor
  OHMS
Nearest higher rated 10% resistor
 
Calculated Resistor Wattage
  WATTS
Recommended resistor power rating of
  WATTS

horizontal rule


LEDs in parallel



Supply Voltage
  VOLTS
Voltage Drop Across LED (Forward V)
  VOLTS
Maximum LED Current
  MILLIAMPS
# of LEDs connected in parallel
  LEDs



Calculated Limiting Resistor
  OHMS
Nearest higher rated 10% resistor
 
Calculated Resistor Wattage
  WATTS
Recommended Resistor power rating of
  WATTS


OTHER LED CALCULATORS

http://ledcalculator.net/

http://led.linear1.org/led.wiz

http://led.linear1.org/1led.wiz

http://electronics2000.co.uk/calc/calcled.php

http://www.hebeiltd.com.cn/?p=zz.led.resistor.calculator

http://ledcalc.com/

http://www.csgnetwork.com/ledsingresistancecalc.html

http://home.cogeco.ca/~rpaisley4/LEDcalc.html

 

F.A.Q.
coming soon...

 

Earthmen Productions
Earthmen Productions
Dec-00-Jun-14

horizontal rule

horizontal rule

 

        

Home | Mini-Flash Flasher | Mini-Beacon Flasher | Maxi-Flash | Easy-Flash | Pro-Flash Flasher | LED Assembly | LED Calculators