Page 4 / 29
April 7, 2019, ©
Elcon
, Switzerland
EL-31_V2.1b_en.docx
It's easy to create a good solder joint, if the following rules are observed:
1.
Use a temperature-controlled pencil-style soldering iron with about 50 to 80 watts. A 1
to 2 mm wide chisel or pyramid tip works best.
2.
Set the temperature for lead-free solder to a maximum of 320°C (608°F) and for
leaded tin to a maximum of 360°C (680°F).
3.
The tip must always be clean and well tinned. Wipe the tip often on stainless steel
wool (to be found in the cleaning-products department at a supermarket), never on a
wet sponge. Otherwise the soldering iron tip cools off unnecessarily, and there is not
enough heat at the solder joint.
4.
Do not use solder pastes, but good quality solder wire with a flux-core.
5.
Keep the soldering iron tip only once, but long enough (approximately 2 to 3 seconds),
to the soldering joint, so that the solder can flow well. During this time enter very little
solder between solder joint and tip.
6.
Never touch the soldering pads on the board; otherwise a good soldering will not be
possible. Should this happen anyway, clean the pcb with a lint-free cloth and benzine.
7.
For multi-pole components such as IC sockets, plugs, etc. solder only 2 pins on diago-
nally opposite corners. This has the advantage that the elements can still be adjusted
and afterwards soldered definitively. Subsequently, all other connections can be sol-
dered.
Always make sure that you do not burn the already soldered components with the sol-
dering iron.
The resistors in the parts list show the respective color coding (see also Table 1). If you are
not familiar in dealing with the color coding, it is better to measure the resistance value with
an ohmmeter prior to soldering.
Color coding of resistors with 4 rings
Color
Resistance
in Ω
Tolerance
1st ring
(1st digit)
2nd ring
(2nd digit)
3rd ring
(multiplier)
4th ring
none
-
-
-
±20%
silver
-
-
10
-2
= 0.01
±10%
gold
-
-
10
-1
= 0.1
±5%
black
-
0
10
0
= 1
-
brown
1
1
10
1
= 10
±1%
red
2
2
10
2
= 100
±2%
orange
3
3
10
3
= 1’000
-
yellow
4
4
10
4
= 10’000
-
green
5
5
10
5
= 100’000
±0.5%
blue
6
6
10
6
= 1’000’000
±0.25%
violet
7
7
10
7
= 10'000’000
±0.1%
gray
8
8
10
8
= 100'000’000
-
white
9
9
10
9
= 1'000'000’000
-
Table 1
