Data Sheet

-30-
35. Switches in Your House
Build the circuit, turn on the switch (62) or touch the
reed switch (83) with magnet (7), you will light two
LED at the same time. If you want to turn off them,
you should disconnect both these two switches. You
might think this type of circuit could be used to have
multiple switches in a room in your house control
the same device(s). However, this type of circuit is
not ideal because the switches do not toggle with
each other. In your house, if you pushed the switch
(62) ON to turn on your lights, then if you moved
the magnet (7) near the reed switch (83) you would
want your lights to go OFF. Your house uses three-
way switches to do this, not the circuit here.
36. Hand Crank Generator Used as
Backup Power Source
Build the circuit, turn on the switch (62) or press
the press switch (61) and you will light up the lamp
(76). If you want to turn off the lamp (76), you have
to disconnect both the switch (62) and the press
switch (61). This circuit represents an OR gate. If
ON = True and OFF = False, then an OR gate is best
dened as: The output is TRUE when any input is
True and False only when all the inputs are False.
In this circuit the output represented by the lamp
(76) is ON (True) if either input represented by the
press switch (61) or the switch (62) or both is ON
(TRUE). The lamp (76) is OFF (False) only when both
switches are OFF (False).
1st level