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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.
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
(except R4)
2.
Diodes, Zener
diodes
3.
Ceramic Capacitors Mounting orientation of no importance.
4.
IC sockets
5.
Light emitting
diodes (LEDs)
6.
Transistors
7.
Pin header
8.
Resistor R4
9.
Relays
10.
Electrolytic
capacitors
11.
Double modular
terminal blocks
12.
ICs in DIL-housing
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.
Mount the sockets that way, the marking on the sockets show
in the same direction as the markings on the PCB board.
Observe the polarity!
With wired LEDs the longer lead is always the anode (positive
pole).
Observe the polarity!
The cross section of transistors for a low power rating in SOT-
packages is shown in the PCB layout.
Solder the resistor that way, it´s body is standing upright on
the PCB.
The mounting orientation is given by the layout of the pins.
Observe the polarity! One of the two leads (the shorter one) is
marked with a minus sign.
Put together the terminal blocks before mounting them.
Insert the ICs into the soldered socket.
Do not touch the ICs without first discharging yourself by
touching a radiator or other grounded metal parts.
Do not bend the "legs" when inserting them into the sockets.
Check that the markings on the PCB, the socket and the IC
show to the same direction.
SD-34 | SD-34.2
Assembling the SD-34 kit | 13
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