Children’s electronic calendar 2019
LEDs, transistors and the piezo transducer
Dear children,
Running up to Christmas there are 24 electronic projects waiting for you. The focus is on transistors, light emitting diodes,
a light sensor and a small speaker. You can build completely different things with these components. There is much to
see, to hear and to experiment! And if you want, you can find the information you need here to learn more about how
everything works.
Self-constructed red LED light
Behind the first door of your calendar you
will find six components, so you can start
right away. There are four things needed
in each experiment: a plug-in board, a
battery clip, a switch and a fuse. For the first
experiment, there is also a resistor and a
light-emitting diode (LED).
The battery cable must be fastened as firmly
as possible so that it does not come loose
during the many subsequent experiments.
The exposed ends of the red and black
cables must be plugged into exactly the right
contact holes on the PCB. But first make
small holes with a needle in the protective
foil on the back of the plate and insert the
cables from below. This prevents them from
slipping easily.
The switch and fuse should be placed
exactly in the position as shown. This
then applies to all other experiments until
Christmas. This will prevent big mistakes
from occurring. The resistor and LED are
part of the first experiment. Make sure the
LED is installed the right way around. It
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