English
FCS-4
Page 26
away. Hold the soldering tip at the spot for a few seconds so that the
solder flows into the joint, then remove the soldering iron.
§
The joint should be held still for about 5 seconds after soldering.
§
To make a good soldering joint you should use a clean and
unoxidised soldering tip. Clean the soldering tip with a damp piece
of cloth, a damp sponge or a piece of silicon cloth.
§
After soldering check (preferably with a magnifying glass) tracks for
accidental solder bridges and short circuits. This would cause faulty
operation or, in the worst case, permanent damage. You can
remove excess solder by putting a clean soldering tip on the spot.
The solder will become liquid again and flow from the soldering
spot to the soldering tip.
Special features of the additional components
Resistors
Resistors reduce current. Their mounting orientation is of no
importance. The value of resistors for smaller power ratings
(under 5 W) is indicated through colour rings. Every colour
stands for another figure. The added resistor has a value of
10 k
Ω
(colour rings brown - black – orange – gold).
Diodes
Diodes allow the current to pass through in one direction only
(forward direction). The diode type is printed on the body.
Diodes must be mounted in a given direction. The negative
end is marked with a ring.
Transistors
Transistors are current amplifiers which convert low signals
into stronger ones. They have three contacts. As they are
polarized, they have to be mounted in a certain direction. Die
BC-Types have a housing in form of a half cylinder (SOT-
housing). The three connecting points are called basis (B),
collector (C) and emitter (E).