FreeBytes RadioKit-120 Руководство по сборке и эксплуатации - Страница 7
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XTAL
20M (14.060 KHz)
8 PIN DIL SOCKET
9 VOLT BATTERY CLIP
INPUT/OUTPUT PINS X 10 PCS
HOW TO READ RESISTOR VALUES
Resistor values are marked on the resistors by the means of color bands.
Standard 5%, 10% or 20% tolerance resistors use a 4 color bands scheme
while 1% and 2% use a 5 color bands scheme. The first two bands represent
the most significant digits of the resistors value. Colors are assigned to all the
numbers between 0 and 9, and the color bands basically translate the numbers
into a visible code. Black is 0, brown is 1, red is 2 and so on (see the color
code table below). The third band indicates the multiplier telling you the power
of ten to which the two significant digits must be multiplied (or how many
zeros to add), using the same assigned value for each color as in the previous
step.
Note: If the multiplier band is gold or silver, the decimal point is moved to the
left by one or two places (divided by 10 or 100).
The tolerance band (the deviation from the specified value) is next, usually
spaced away from the others, or it's a little bit wider. A color is assigned to
each tolerance: gold is 5%, silver is 10%. 20% resistors have only 3 color
bands - the tolerance band is missing. The 5 band code is used for marking
high quality, precision resistors with 2%, 1% or lower tolerances. The rules are
similar to the previous system; the only difference is the number of digit
bands. The first 3 bands will represent the value, the 4th band will be the
multiplier and the 5th stripe will give us the tolerance. In the case of RadiØKit-
1 the resistors used are of the 1% tolerance type so the 5 band code applies.
Resistor color code table:
1st
Color
digit
Black
0
Brown
1
Red
2
Orange
3
Yellow
4
Green
5
Blue
6
Violet
7
Gray
8
White
9
Gold
Silver
None
2nd
3rd
digit
digit
0
0
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
Multiplier
0
×10
1
×10
2
×10
3
×10
4
×10
5
×10
6
×10
7
×10
8
×10
9
×10
×0.1
×0.01
Tolerance
±1%
±2%
±0.5%
±0.25%
±0.1%
±0.05%
±5%
±10%
±20%