Page
6
of
10
X
C
3
7
5
4
S
o
ld
er
in
g
G
u
id
e
XC3754 Soldering Guide
Soldering the resistors
You will find 4 resistors in this kit, 2 of them are together on the same tag (220 ohms)
which correspond to
R3
and
R4
on the PCB board.
You can check what value they are by the resistor colour codes: for 220 ohms, you
should find
red-red-black-black-brown
, which is a 5-band colour code.
Each of these colours stand for a number, which corresponds to the resistor chart. It’s
easy enough to remember as a rainbow that starts with black, brown, then goes through
red to violet, then grey and white (
which are rarely used
).
With a 5 band colour code, bands 1-3 are digits, then the 4
th
is a multiplier (such as
“1000”. The 5
th
band is usually separated away from the other bands so you know which
way the resistor is orientated, and just means tolerance, or how precise it is.
See if you can figure out how to read the 220-ohm resistor bands
Colour
Digit
Multiplier
Black
0
×1
Brown
1
×10
Red
2
×100
Orange
3
×1000
Yellow
4
×10 k
Green
5
×100 k
Blue
6
×1 M
Violet
7
×10 M
Grey
8
×100 M
White
9
×1 G (for Giga-ohms)
If you get stuck, there’s plenty of online calculators to try out. 4 band resistors simply
have two digits, along with the multiplier and tolerance.
Once you’ve got one of the two, 220Ω resistors, use a pair of pliers to bend the legs to a
straight 90° angle, close to the body, as shown below.
