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The Resistor Colour Code
Click for larger image
The body colour is the first digit.
The next digit is the Left hand end colour
The spot in the middle of the body is the multiplier.
The Right hand end colour is the tollerance ie Silver,Gold etc.
How to remember the colour code.
Something I picked up many years ago.
(7) Violet=In Vain
Richard Of York Gave Battle in Vain.
Remember that line and add Black = 0, Brown = 1, Grey = 8 or White = 9 (as above) to complete the sequence.
How to read Capacitor Codes
Most will have three numbers, but sometimes there are just two numbers. These are read as Pico-Farads. An example: 47 printed on a small disk can be assumed to be 47 Pico-Farads (47pf).
Now, what about the three numbers? It is somewhat similar to the the resistor code. The first two are the 1st and 2nd significant digits and the third is a multiplier code. Most of the time the last digit tells you how many zeros to write after the first two digits.
1 mili Farad is 1/1,000th or .001 times the unit. (10-3)
1 micro = 1/1,000,000 or 0.000 001 times the unit (10-6 )
1 nano = 1/1,000,000,000 or 0.000 000 001 times the unit (10-9 )
1 pico = 1/1,000,000,000,000 or 0.000 000 000 001 times the unit (10-12 )
Now for an example: A capacitor marked 104 is 10 with 4 more zeros or 100,000pF which is referred to as a .1 uF capacitor.
Capacitor Colour Codes
Audio Reference Chart
Loudspeaker Transformer Ratio Table
Last updated 5.12.2008