Resistor Color Code

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The color codes of a resistor are read from left to right, with the tolerance band oriented to the right side. Match the color of the first band to its associated number under the digit column in the color chart. This is the first digit of the resistance value. Match the second band to its associated color under the digit column in the color chart to get the second digit of the resistance value.

Match the color band preceding the tolerance band (last band) to its associated number under the multiplier column on the chart. This number is the multiplier for the quantity previously indicated by the first two digits (four band resistor) or the first three digits (five band resistor) and is used to determine the total marked value of the resistor in ohms.

To determine the resistor's tolerance or possible variation in resistance from that indicated by the color bands, match the color of the last band to its associated number under the tolerance column. Multiply the total resistance value by this percentage.

For example, the first resistor shown at the top of this page has a resistance of (47 X 100) = 4700 ohms. The tolerance is plus or minus (10% X 4700) = plus or minus 470 ohms. The second resistor has a resistance of (470 X 1) = 470 ohms. The tolerance is plus or minus (2% X 470) = plus or minus 9.4 ohms.

You can download resistor color code software from here.

Resistor color code

Resistor color code 2

Capacitor Conversion

Microfarads (uF)                       Nanofarad (nF)                    Picofarads (pF)

      0.000001                                           0.001                                                 1

      0.00001                                             0.01                                                   10

      0.0001                                               0.1                                                     100

      0.001                                                 1                                                        1000

      0.01                                                   10                                                      10000

       0.1                                                    100                                                    100000

   
       1                                                       1000                                                  1000000

      10                                                      10000                                                10000000

      100                                                    100000                                              100000000

Light Switch

The circuit which is being presented here is a switch that will be activated by light falling on a sensor.The circuit uses a Light Dependent Resistor (LDR) as a sensor and three transistors to amplify the signals from the LDR and drive the relay which does the switching.

Led Chaser

Automatic room light with visitor counter

When somebody enters into the room the counter incremented by one and the light in the room will be switched ON and when any one leaves from the room  the counter is decremented by one. The light will be only switched OFF until all the persons in the room go out.The total number of persons inside the room is also displayed on the seven segment displays.

My Clock

         My 7 Segment Display Clock.............