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3.5. Assembly
Proceed according to the order given in the list below. First solder the components on the
solder side of the PCB and then cut the excess wires with the side cutter. Follow the
instructions on soldering in section 3.2.
Caution:
!
Several components have to be mounted according to their polarity. When soldering these
components the wrong way round, they can be damaged when you connect the power. In
the worst case the whole circuit can be damaged. At the best, a wrongly connected part will
not function.
1.
Resistors
2.
Diodes, Zener diodes
3.
Ceramic Capacitors
4.
IC sockets
5.
Transistors
6.
Rectifiers
7.
Electrolytic capacitors
8.
Relays
9.
Light emitting diodes
(LEDs)
Srew terminals
10.
11.
Trimm-potentiometers
Mounting orientation of no importance.
Observe the polarity!
The negative end of the diodes is marked with a ring. This is
shown in the PCB layout.
Solder the diode D6 and D7 that way, their bodies are
standing upright on the PCB.
Mounting orientation of no importance.
Mount the sockets that way, the markings on the sockets
show in the same direction as the markings on the PCB
board.
Observe the polarity!
The cross section of transistors for a low power rating in
SOT-packages is shown in the PCB layout.
With transistors for a high power rating in TO packages (e.g.
BD types) the unlabelled back side is marked in the PCB
layout by a thick line.
Observe the polarity! The pin connections are printed on the
housing. The longer connecting pin is the positive pole.
Observe the polarity! One of the two leads (the shorter one)
is marked with a minus sign.
The mounting orientation is given by the layout of the pins.
Observe the polarity!
With wired LEDs the longer lead is always the anode
(positive pole).
Terminal strips and box header of the plug-in unit.
The mounting orientation is preset by the layout of the three
pins.
KSM-3
Assembling the kit | 15
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