Project #pc14 microphone – Elenco Projects PC1-PC73 User Manual

Page 26

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Click on the

FFT button to look at the frequency spectrum for these

signals. For best viewing set the

amplitude and time scales (really

amplitude and frequency scales in FFT mode) to be as shown here.

FFT button

Amplitude scale

Time scale

Press the press switch (snap part S2) several times to step through
the eight different sounds from the space war integrated circuit.
Hold it down for a few seconds each time so you can see the
frequency spectrum representing the sound you hear.

Here are sample spectrums from some of the other sounds using
the same settings as above:

Build the circuit shown and connect the PC-interface cable to the
microphone input on your computer.

Project #PC14

Microphone

OBJECTIVE: To see what your voice looks like in electrical
form.