WRM-4
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ms elektronik
Transistors
Transistors are current amplifiers which convert low signals into stronger ones. There are
several types in different package forms available. The type designation is printed on the
component.
Transistors for a low power rating (e.g. BC types, BS types) have a package in
form of a half zylinder (SOT-package). The three pins of bipolar transistors (e.g.
BC, BD and BT types) are called basis, emitter and collector (abbreviated with the
letters B, E, C in the circuit diagram).
Integrated circuits (ICs)
Depending on the type, ICs fulfil various tasks. The most common housing form
is the so-called "DIL"-housing, from which 4, 6, 8, 14, 16, 18 or more "legs"
(pins) are arranged along the long sides.
ICs are sensitive to damage during soldering (heat, electrostatic charging). For
that reason in the place of the ICs IC sockets are soldered in, in which the ICs
are inserted later.
Voltage regulators
Voltage regulators are ICs, which convert a variable, non regulated input voltage
in a constant output voltage. They are produced in transistor housings with three
connecting pins for input, output and earth.
With voltage regulators in a flat TO-housing the unlabelled rear is marked by a
thick line on the PCB layout.
Terminal strips
Terminal strips are solder-in screw-type terminals. They provide a solder-free and safe
connection of the cables to the circuit, which can still be separated any time.
10 | Assembling the kit