Data Sheet

-44-

56. Brushless Motors

Build the circuit shown on the left, turn on the switch (62) and you will

see the lamp (76) and the motor (95) spin at the same time. Now if you

move the magnet (7) near the reed switch (83), you will see the lamp

(76) go off while the motor (95) is running faster. Reed switches can

actually be used to create what are called brushless motors.

57. Motor Speed Selection Circuit

Replace the reed switch (83) with the press switch (61). Turn on the

switch (62) and you will see the lamp (76) is on and the motor (95) spin.

If you press the press switch (61), you will see the lamp (76) is off while

the motor (95) is spinning faster. This circuit demonstrates how speeds

of a remote control toy car can be controlled.

58. Voltage and Current in Parallel Circuits

Build the circuit shown on the left, turn on the switch (62) and you

will see the two LEDs light at the same time. Turn off the switch (62)

and the LEDs will go off. If you think about Kirchhoff’s laws in projects

#42 & #43, you can conclude that the voltage across components in

parallel is the same, while the current through components in parallel

are usually different.

WARNING: Moving parts. Do not

touch the motor during operation. Do

not lean over the motor.

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1st level