Elenco Upgrade Kit SC500 to SC750 - Manual (Page 107)

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Sample Frequency Spectrum
Modify the circuit for project PC4 by connecting points X and Y on the
snap diagram. Now the sound is a machine gun, it shuts off between
bursts.
Look at the waveform and frequency spectrum using the same
settings as for project PC4, and compare them to those for the siren.
Project #PC5
Light & Sounds PC (II)
Modify the circuit by removing the connection between X and Y and
then make a connection between T and U. It makes a fire engine
sound.
Look at the waveform and frequency spectrum using the same
settings as for project PC4. The waveform slowly rises and falls in
pitch, and gives a clear spectrum that slowly rises and falls in
frequency.
Project #PC6
Light & Sounds PC (III)
Remove the connection between T and U and then make a
connection between U and Z. It makes an ambulance sound.
Look at the waveform and frequency spectrum using the same
settings as for project PC4. It alternates between two frequencies.
Project #PC7
Light & Sounds PC (IV)
Remove the connections between U and Z and between V and W,
then make a connection between T and U. It makes a water faucet
sound.
Look at the waveform and frequency spectrum using the same
settings as for project PC4. This sound is different from the others
and seems to have little or no pattern.
Project #PC8
Light & Sounds PC (V)
Sample Frequency Spectrum