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46. Press Switch-controlled Bi-
directional LED & Alarm
Build the circuit, hold the press switch (61), you will
hear the alarm (78) sound, while the bi-directional
LED (71) turns on red. Release the press switch
(61), then install the bi-directional LED (71) in the
reverse direction. Hold the press switch (61), you
will see the bi-directional LED (71) will turn on blue
and the alarm will sound very faintly. If you release
the press switch (61), the alarm (78) and the bi-
directional LED (71) will turn off.
47. Magnet-controlled Bi-
directional LED and Alarm
Build the circuit, move the magnet (7) towards
the reed switch (83), the alarm (78) will sound
while the bi-directional LED (71) turns on red.
Move the magnet (7), then install the bi-
directional LED (71) in the reverse direction.
Now if you move the magnet (7) towards the
reed switch (83), the bi-directional LED (71) will
turn on blue and the alarm will sound very faintly.
If you move the magnet (7) away, you will see the
alarm (78) and bi-directional LED (71) turn off.
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