tams elektronik MT-1, Руководство пользователя, Страница: 15 / 36

tams elektronik
MT-1 | MT-2 | MT-3 English
Diodes and Zener diodes
Diodes allow the current to pass through in one direction
only (forward direction), simultaneously the voltage is
reduced by 0,3 to 0,8 V. Exceeding of the limit voltage
always will destroy the diode, and allow current to flow in
the reverse direction.
Zener diodes are used for limiting voltages. In contrast to "normal"
diodes they are not destroyed when the limit voltage is exceeded.
The diode type is printed on the package.
Light emitting diodes (LEDs)
When operated in the forward direction the LEDs light.
They are available in several different versions (differing in
colour, size, form, luminosity, maximum current, voltage
limits).
Light emitting diodes should always be connected via a
series resistor which limits the current and prevents failure.
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) have a
package in form of a half zylinder (SOT-package).
Transistors for a high power rating (e.g. BD types) have a
flat package (TO-package), which is in use in different
versions and sizes.
The three pins of bipolar transistors (e.g. BC and BD
types) are called basis, emitter and collector (abbreviated
with the letters B, E, C in the circuit diagram).
Seite 15