Elenco Upgrade Kit SC500 to SC750 - Manual (Page 142)

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Project #PC63
Electronic Sound PC
OBJECTIVE: To view the output of an oscillator circuit.
Build the circuit and try the settings shown. Press the press
switch to lower the frequency of the signal by increasing the
capacitance in the oscillator. You can replace the 0.1
m F capacitor
C2 with the 10 m F capacitor C3 (“+” on the right) to further lower the
frequency of the tone. You may try other settings to zoom in or look
at the frequency spectrum.
Settings
Project #PC64
Replace the 100K W resistor R5 with the 10K W resistor R4, place the
0.1
m
F capacitor back in the circuit as before. Now you change the
frequency by changing the resistance in the oscillator.
Electronic Sound
PC (II)