Fig.3.07: bread board glued
to a mounting board
(mounting board not
included)
3.1.5 LEDs
Compared to a normal diode the LED (light emitting diode) has one further
characteristic! It shines when voltage is applied. You find a red, an orange,
2 white shining LEDS and a red flashing LED. You can identify the
flashing LED through its black spot within its red enclosure. The dark spot
is the integrated circuit which causes the LED to flash as soon as the correct
voltage is applied.
LEDs should always be operated with a series resistor for current limiting,
otherwise they can break.
Fig.3.08: circuit symbol, LED, the arrow
shows the technical direction of the
electric current, A symbolises anode (+)
and K cathode (-)
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