User manual

English WBA-1/WBA-2
Page 26
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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.
BC-Types have a housing in form of a half cylinder (SOT-
housing). The cross section is shown in the PCB Layout which
determines the mounting orientation.
PCB sockets
The widely spread 2,6 mm model railway connectors fit exactly to the
sockets. These are used for the connection to the voltage supply and to
connected modules or components.
Assembling the kit
Start the assembly with the PCB sockets. Continue with the resistors
and the diode. First solder the components on the solder side of the
PCB and then cut the excess wires with the side cutter as short as
possible. Next solder the transistors and finally the capacitors.
Caution:
Diodes, transistors and electrolytic capacitors must be placed in the right
direction! If you solder them the wrong way the affected parts can be
damaged when you connect the power. In the worst case the whole circuit
can be damaged. In any case, a wrongly connected part will not function.
Performing a visual check
Due to material defects and/or improper assembly there may be risks of
injury. Transport damage to ready-built modules is also possible. So
you must perform a visual check after the assembly or after unpacking
the module.
Caution:
Do not power up the module yet.
Check all nuts, pins and connections as well as the mechanical
connections for correct assembly.