Project #591, Ac voltage (iii), Project #592 – Elenco Upgrade Kit SC500 to SC750 User Manual
Page 43: Noisemaker (ii)
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Project #591
OBJECTIVE: To use AC voltage.
AC Voltage (III)
This project is similar to project #589. When the slide switch (S1) is
turned on, the relay (S3) sounds and the light bulbs (L1 & L2) and
LED’s (D1 & D2) flash. Now when the press switch (S2) is pressed,
the speaker (SP) also sounds.
Project #592
OBJECTIVE: To create a sound circuit.
Noisemaker (II)
Turn on the slide switch (S1) and the relay (S3) generates a buzzing
noise. Increase the voltage across the relay by pressing the press
switch (S2). The tone changes because the relay’s contacts are
opening and closing faster.
!
WARNING:
Moving parts. Do not touch the fan or
motor during operation. Do not lean over the motor.
To learn more about how circuits work, visit www.snapcircuits.net or page 85 to find out about our Student Guides.
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