Elenco Upgrade Kit SC500 to SC750 - Manual (Page 141)

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Project #PC59
Variable Oscillator PC
OBJECTIVE: To view the output of an oscillator circuit.
Build the circuit and try the settings shown. Move the adjustable
resistor lever to change the pitch of the sound and pulse separation
in the waveform.
Settings
Project #PC60
Connect the whistle chip across points A & B, then B & C, then D & E and
observe how the waveform changes as the sound changes. Sometimes
the speaker sound and waveform are unchanged, but the whistle chip
itself makes new sound.
Project #PC61
Remove the speaker. Connect the PC
interface cable across the whistle chip
and install the whistle chip across
points A & B, then B & C, then D & E
and observe how the waveform
changes as the sound changes. Try
different settings of the adjustable
resistor.
The waveform for A & B is
shown.
Variable Oscillator
PC (III)
Variable Oscillator
PC (II)
Project #PC62
Replace the 100K
W
resistor R5 with the photoresistor RP, wave your hand or
a piece of paper over it and observe how the sound and waveform change.
Variable Oscillator
PC (IV)