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PZS-3
Capacitors
Among other things capacitors are used for filtering interference
voltages or as frequency determining parts. Ceramic capacitors
are not polarized, for that reason their mounting orientation is
of no importance. Normally they are marked with a three-digit
number which indicates the value coded.
Value
100 nF
Electrolytic capacitors
Electrolytic capacitors are often used to store energy. In
contrast to ceramic capacitors they are polarized. One of the
two leads is marked with a minus sign which indicates the
mounting orientation. The value is given on the casing.
Electrolytic capacitors are available with different voltage sustaining
capabilities. Using an electrolytic capacitor with a voltage sustaining
capability higher than required is always possible.
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.
The diode type is printed on the body. Diodes must be
mounted in a given direction. The negative end is marked
with a ring. This is shown in the PCB layout.
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). The
longer lead of wired LEDs is always the anode (positive pole).
Light emitting diodes should always be connected via a series
resistor which limits the current and prevents failure.
Number
104
English
Page 39
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