Elenco Projects PC1-PC73 - Manual (Page 30)

Project #PC17
Doorbell PC
OBJECTIVE: To look at the output of a musical circuit.
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Build the circuit shown. If continuing from the previous experiment
then close the Winscope program and run it again, to reset the
settings. Click on the On-Line button to activate, and turn on the
slide switch (snap part S1). Try the
settings shown here. When
the music stops, press the press switch (part S2) and it will resume.
Settings
Click on the 5ms/div time scale button and on the FFT button to
look at the frequency spectrum for the signal. The Y1 gain control
is set for high gain now, so the higher peaks are off the screen but
lots of the lower peaks are visible.
Note that the sound is music and the oscilloscope waveform has a
“square” shape, as a result the frequency spectrum has a lot of
peaks with equal spacing.
Now adjust the gain lower until you see the higher peaks.
5ms/div time
scale button Y1 gain control FFT button