54. Magnet, Switch & Press
Switch-controlled Alarm &
Lamp Series Connection
Build the circuit, press the switch (62),
then hold the press switch (61). Move the
magnet (7) towards the reed switch (83),
you will hear the alarm (78) sound while the
lamp (76) is still off. If you release the press
switch (61) or move the magnet (7), the
alarm (78) will turn off.
55. Magnet, Switch & Press
Switch-controlled Alarm &
Bi-directional LED Series
Connection
Build the circuit, press the switch (62), then
hold the press switch (61). Move the
magnet (7) towards the reed switch (83),
you will hear the alarm (78) sound very
faintly while the bi-directional LED (71) turns
on blue. If you release the press switch (61),
or move the magnet (7) away, the alarm
(78) and bi-directional LED (71) will turn off.
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