Instructions

Game and Knowledge in Electronics-Lab
10
TC3
R
G
B
TC4
TC1
TC2
4.5v
BAT BAT
You can only see one LED
here, but there are really
three LED crystals with
different colours installed.
That’s why there are three
connections for the three
colours. You are already
familiar with the common
negative connector; that’s
the same as for the LED
strip.
Try out all three colours
and then also try to mix
two or three colours.
To do this, you need
additional cables that
connect the positive pole
of the battery with the
connectors TC1 and TC3.
TC1 connects the red LED,
TC2 the green LED and
TC3 the blue LED. The
abbreviation TC stands for
tricolour (three colours).
TC3
R
G
B
TC4
TC1
TC2
4.5v
BAT B AT
TC3
R
G
B
TC4
TC1
TC2
4.5v
BAT B AT
LED with three
colours
5
Each LED has its colour;
there are green, red, blue,
yellow and many other
colours. The colour of an LED
depends on the material of the
semiconductor used as LED
crystal. There are three different
LED crystals on one common
cathode connection in the LED
with the three colours.
When it is switched off, you
can use a magnifying glass
to see them; they look very
different and are installed next
to each other in a row.
Be careful, when the LED is
switched on. You must not look at the
LED from a close distance and certainly
not using a magnifying glass because the
bright light can damage your eyes.
When all three LEDs are switched on, hold
a sheet of white paper in front of the LED.
You can see three coloured circles, which
are offset. The LED enclosure acts as a
lens, which creates the three colours on the
paper.
Inside the LED module, you can see three
resistors for the three LEDs named R1, R2
and R3. When taking an even closer look
with a magnifying glass, you can see
that the three resistors are totally different.
Each can create a different current for the
purpose of making all three colours appear
with the same brightness.