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tams elektronik
3.3. Preparation
Put the sorted components in front of you on your workbench. The separate electronic
components have the following special features you should take into account in assembling:
Resistors
Resistors reduce current.
The value of resistors for smaller power ratings is indicated through colour rings.
Every colour stands for another figure.
Carbon film resistors have 4 colour rings. The 4th ring (given in brackets here)
indicates the tolerance of the resistor (gold = 5 %).
Value:
150
4,7 k
22 k
Trimm-potentiometers
Trimm-potentiometers (abrv. "trimm-pots") are resistors which allow the value of
resistance to be varied and that way to be adapted to the particular demands. In
the middle they have a small slot into which a small screwdriver can be put in
order to vary the value of resistance. The maximum value is printed on the
housing.
Depending on the mounting situation trimmpots with a lying or a standing package are used.
Ceramic capacitors
Among other things ceramic capacitors are used for filtering interference voltages
or as frequency determining parts. Ceramic capacitors are not polarized. Normally
they are marked with a three-digit number which indicates the value coded.
Number:
224
474
Electrolytic capacitors
Electrolytic capacitors are often used to store energy. In contrast to ceramic
capacitors they are polarized. The value is given on the package.
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 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.
Colour rings:
brown - green - brown (gold)
yellow - violet - red (gold)
red - red - orange (gold)
Value:
220 nF
470 nF
KSM-3
Assembling the kit | 11
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