50. Magnet-controlled Fiber
Optic Tree & Alarm Series
Connection
Build the circuit, move the magnet (7)
towards the reed switch (83), the alarm
(78) will sound very faintly. Then you will see
the fiber optic tree (40) turn on with the
light of the colorful LED (72). If you move
the magnet (7) away the alarm (78) and
colorful LED (72) will turn off.
51. Switch and Press Switch-
controlled Alarm and LED
Series Connection
Build the circuit, press the switch (62),
then hold the press switch (61), you will
hear the alarm (78) start with its pitch
varying from low to high, also the LED (69)
will turn on. Release the press switch (61),
the alarm (78) and LED (69) will turn off.
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