Volthaus Online LED/Resistor Calculator

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Resistor Colors and Values Chart


We have a handy chart showing the colors and values
of resistors. We have a large 1200 pixel wide version
and a huge PDF version. We hope it comes in handy.

Slightly larger version
1200 PX jpeg version click to download
Right Click and 'Save As'
Huge PDF version click to download
Right Click and 'Save As'

About us

Volthaus Electronic Laboratory is the home for people who love the hobby of electronics.

Check out our new electronic DIY kits.

Motion Activated Alarm Kit

$9.99 + .99 s&h (We ship to U.S. only from Austin, Texas)

 

If you are just beginning your journey into hobby electronics you can’t go wrong with this kit. It is simple and fun.  Really fun. Educational, handy, and great for pranks
This kit includes:
  • PIR passive infrared motion detector (1)
  • 9v Active buzzer (1)
  • Mini bread board (1)
  • High Quality 9v battery snap (1)
  • Jumper wires (5) male/female
  • Detailed instruction and schematic sheet
  • Colors May Vary

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LED Single - LEDs in series - LEDs in parallel

The average LED Voltage drop is usually 1.9~2.2V
Current is usualy 20mA
Add your supply voltage and click calculate


Single led:

Single led with single resistor
Supply Voltage
VOLTS
Voltage Drop Across LED
VOLTS
Desired 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


Leds in series:

Several leds in series with one resistor
Supply Voltage
VOLTS
Voltage Drop Across LED
VOLTS
Desired LED Current
MILLIAMPS
How many leds connected




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:

Several leds connected parallel with one resistor
Supply Voltage
VOLTS
Voltage Drop Across LED
VOLTS
Desired LED Current
MILLIAMPS
How many leds connected




Calculated Limiting Resistor
OHMS
Nearest higher rated 10% resistor

Calculated Resistor Wattage
WATTS
Safe pick is a resistor with
power rating of
WATTS