Elenco Upgrade Kit SC500 to SC750 - Manual (Page 96)

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Project #PC1
OBJECTIVE: To look at the output signal from a transistor oscillator while changing the pitch of the sound.
Pitch PC
You will now be introduced to the Winscope features, and thereby
become familiar with oscilloscopes and spectrum analyzers, and
see some of the most important concepts in electronics. It is
recommended that you already be familiar with the Snap Circuits
parts and assembly methods from the other manuals.
Build the circuit shown and connect the PC-interface cable to the
microphone input on your computer. Turn on the slide switch
(S1) and vary the adjustable resistor (RV). The frequency or
pitch of the sound is changed. Run the Winscope software and
be sure your microphone input is configured properly, as
described earlier.