Elenco Upgrade Kit SC100 to SC750 - Manual (Page 199)

-58-
Project #630
OBJECTIVE: To add sound to a stepper motor circuit.
Stepper Motor w/ Sound
Modify project #630 by removing the speaker (SP) and replacing it with the lamp (L1).
Now when you turn the slide switch (S1) on, the lamp lights as the motor spins.
Set the adjustable resistor (RV) to the middle position. Turn the slide switch (S1) on and
the motor (M1) pulses on and off as the speaker (SP) sounds. As the circuit oscillates,
the relay’s (S3) contacts open and close shorting the motor and speaker to ground. See
how much you can adjust the adjustable resistor before the motor turns off or
continuously spins.
Project #631
OBJECTIVE: To add light to a stepper motor circuit.
Stepper Motor w/ Light
Project #632
OBJECTIVE: To display the letter “P” as the alarm IC sounds.
Police Siren with
Display
Turn the slide switch (S1) on and the speaker (SP) sounds as the letter
“P” lights. You also hear the music IC (U1) playing in the background.
The alarm IC (U2) plays as long as the music IC is on since U2 is
connected to U1’s output. After 20 seconds, the circuit turns off for 5
seconds and then starts again.
!
WARNING: Moving parts. Do not touch the fan or
motor during operation. Do not lean over the motor.