Elenco Upgrade Kit SC500 to SC750 - Manual (Page 40)

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Project #584
OBJECTIVE: To create a sound circuit.
Motor Sound Using
Transformer
Project #585
OBJECTIVE: To create a sound circuit.
Motor Sound with LED
In this project, you will drive the whistle chip (WC) and LED’s using the
motor (M1) and transformer (T1). Turn the slide switch (S1) on. The
motor begins spinning and the red LED (D1) lights. Now press the
press switch (S2), the voltage generated from the transformer is now
across the whistle chip and green LED (D2). The whistle chip sounds
as the green LED lights.
OBJECTIVE: To create a sound circuit.
Motor Sound with LED (II)
Project #586
Modify project #585 by replacing the 6V lamp (L2) with the speaker
(SP). Now the speaker (SP) will also output sound.
!
WARNING: Moving parts. Do not touch the fan or
motor during operation. Do not lean over the motor.
Turn the slide switch (S1) on and then rapidly turn on and off the press
switch (S2). This causes a magnetic field to expand and collapse in
the transformer (T1). The small voltage generated is then amplified by
the power amplifier IC (U4) and the speaker (SP) sounds. Replace
switch S2 with the motor (M1, leave the fan off) and you can hear how
fast the motor spins. To hear the sound better, connect the speaker to
the circuit using the red and black jumper wires (instead of the 2-
snaps) and hold it next to your ear.
!
WARNING: Moving parts. Do not touch the fan or
motor during operation.
To learn more about how circuits work, visit www.snapcircuits.net or page 85 to find out about our Student Guides.