9. Magnet-controlled
Bi-directional LED
Build the circuit, move the magnet (7)
towards the red switch (83), the bi-
directional LED (71) will turn on blue. Move
the magnet (7) away, the light will turn off.
Install the bi-directional LED (71) in the
reverse direction, then move the magnet
(7) towards the reed switch (83), the bi-
directional LED (71) will turn on red.
10. Alarm Switch
Build the circuit, press the switch (62), you
will hear the alarm (78).
Red Light
B
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