Elenco Upgrade Kit SC100 to SC750 - Manual (Page 49)

-48-
Project #238
Trombone
OBJECTIVE: To build an electronic trombone that changes pitch
of note with slider bar.
When you turn on the slide switch (S1) the trombone should start playing.
To change the pitch of the note, simply slide the adjustable resistor (RV)
control back and forth. By turning the slide switch on and off and moving
the slider, you will be able to play a song much like a trombone player
makes music. The switch represents air going through the trombone, and
the adjustable resistor control is the same as a trombone slider bar. The
circuit may be silent at some positions of the resistor control.
Project #239
Race Car Engine
OBJECTIVE: To show how changing frequency changes the
sound to a different special effect.
Use the circuit from project #238 shown on the left, but change the
0.02
μF capacitor (C1) to a 10μF capacitor (C3). Make sure the positive
(+) mark on the capacitor is NOT on the resistor (R2) side when you snap
it in.
When the slide switch (S1) is turned on, you should hear a very low
frequency oscillation. By sliding the adjustable resistor (RV) control up
and down, you should be able to make the sound of a race car engine as
it’s motor speeds up and slows down.
To learn more about how circuits work, visit www.snapcircuits.net or page 74 to find out about our Student Guides.