Elenco Projects PC1-PC73 - Manual (Page 40)

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Project #PC25
Tone Generator PC
OBJECTIVE: To build a high frequency oscillator.
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
switch. Set Winscope to the
settings shown below. A sample
waveform is shown here.
Settings
Turn on FFT mode to look at the frequency spectrum, try the
settings shown here.
Settings
Modify the circuit for project PC25 by placing the 0.02
m
F capacitor
(C1) on top of the whistle chip (WC). Look at the waveform and
frequency spectrum using the same settings as for project PC19,
the frequency is lower now.
Modify the circuit for project PC25 by placing the 0.1
m
F capacitor
(C2) on top of the whistle chip (WC). Look at the waveform and
frequency spectrum using the same settings as for project PC19,
but you may want to change the time scale since the frequency is
much lower now.
Project #PC26
Tone Generator PC (II)
Project #PC27
Tone Generator PC (III)