Vectronics VEC-1500K - Manual (Page 37)

32
LESSON 8
Component Handling and Preparation
We've looked closely at what happens on the bottom side of the board. This
section takes a look at what happens on top. In order to follow diagrams and
build working circuits, you'll need to recognize common components and read
their value codes.
Resistors
Resistors limit current flow and provide voltage drop in electrical circuits. For
low power circuitry, 1/4 or 1/8-watt molded resistors are most common. The
resistive value of these devices is displayed by means of a banded color code.
1st Digit
2nd Digit
Multiplier
Tolerence
Black = 0 (tens)
Brown = 1 (hundreds)
Red = 2 (K)
Orange = 3 (10K)
Yellow = 4 (100K)
Green = 5 (1Meg) Blue = 6
Violet = 7
Gray = 8
White = 9
Silver = 10%
Gold = 5%
Resistor Color Code
(gold or silver)
When you look at a resistor, check its multiplier code first. Any resistor with a
black multiplier band falls between 10 and 99 ohms in value. Brown designates
a value between 100 and 999 ohms. Red indicates a value from 1000 to 9999
ohms, which is also expressed as 1.0K to 9.9K. An orange multiplier band
designates 10K to 99K, etc.
Capacitors
Capacitors store electric energy, block the flow of DC current, and permit the
flow of AC current. Unlike modern-day resistors, capacitors no longer use a
color code for value identification. Instead, the value, or a 3-number code, is
printed on the body.
Multilayer
271
(270 pF)
Ceramic Discs
|
|
1uF
35V
+
-
104
Electrolytic
1 uF
10 pF = 100
100 pF = 101
1000 pF = 102
.001 uF = 102*
.01 uF = 103
.1 uF = 104
Value Code
102
(.001 uF) (.1 uF)