Data Sheet

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51. Power Outage
Build the circuit as shown on the left and turn on the switch
(62). Press the press switch (61) and you will light up the
heart LED (69) and the star LED (70) at the same time.
You could use this circuit to simulate a power outage in your
neighborhood. Pretend the switch (62) is the power plant
in your neighborhood and the press switch (61) represents
switches in your house. The press switches (61) in your
house will work as long as the power plant is up and working
(the switch (62) is ON), but none of the switches in your
house will turn on a light is the power plant goes down (the
switch (62) is OFF).
52. Visual Alarm
Build the circuit as shown on the left and turn on the switch
(62) or touch the reed switch (83) with the magnet (7). This
will light up the heart LED (69) and the alarm (78) will sound
too. But the sound from the alarm (78) is faint in this circuit
since the alarm (78) is in series with the heart LED (69).
The heart LED (69) in this circuit is useful as a visual alarm
in case the audio alarm (78) cannot be heard (e.g. it’s loud
in the room).
1st level
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