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Project #238
Trombone
OBJECTIVE: To build an electronic trombone that
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 control
(RV) back and forth. By turning the slide switch (S1) 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 control is same as 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
Use the circuit from Project 238 shown on the left, but change the 0.02µF
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 switch is turn on, you should hear a very low frequency
oscillation. By sliding the adjustable resistor control (RV) 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.
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