Data Sheet

-117-
287. Motor and Speaker in Parallel
Build the circuit shown on the left, then turn on the switch (62) and you will
hear sounds of a police siren from the speaker (93). Also, you will see the
motor (95) is spinning at the same time. The motor (95) and speaker (93)
are in parallel in this circuit so they both get enough current to operate.
288. Motor Syncing to Gun Shots
Connect points C and D with a 4-wire (4) in project #287, turn on the switch
(62) and you will hear gun shots and the motor (95) will spin at the same
time. Notice how the motor (95) spinning syncs to the gun shots. This could
be used to create cool synchronized visual/audio effects.
289. Motor Syncing to Fire Siren
Connect points A and B with a 4-wire (4) in project #287, turn on the switch
(62) and you will hear a re siren and the motor (95) will spin at the same
time. Notice how the motor (95) spins fast when the re siren is at its
highest pitch and highest volume but spins slower when the re siren is at
it’s lowest pitch and lowest volume. The speed that the motor (95) spins is
related to the amplitude of the speaker signal, so it’s the volume of the re
siren that the motor (95) is syncing to.
290. Electric Cars
Connect points E and F with a 4-wire (4) in project #287, turn on the switch
(62) and the sounds of space battle will turn on and the motor (95) will spin
at the same time. Did you know that some electric cars are so quiet that they
actually add noise for safety reasons? This is to protect people, particularly
the blind, from not hearing a car coming.
291. Birthday Card
Connect points G and H with a 4-wire (4) in project #287, turn on the switch
(62) and you will hear music and the motor (95) will spin at the same time.
You could put this circuit into a birthday card that plays happy birthday while
rotating a cool looking spin-wheel.
292. Robotic Sensor
Replace the switch (62) with the reed switch (83) in project #287. Hold the
magnet (7) near the reed switch (83) and you will hear sounds of a police
siren from the speaker (93). Also, you will see the motor (95) is spinning at
the same time. Reed switches can be used as proximity sensors for robotic
motion and industrial automation.
[ 287 - 292 ]