Elenco 130-in-1 Electronics Playground - Manual (Page 82)

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The “R-C” in this experiment’s name represents
resistance-capacitance. You have seen how varying
resistance and capacitance can affect the pulsing
action of an oscillator. This experiment lets us see
the effects when we can alter the strengths of both
resistors and capacitors.
View the schematic. You can see the switch lets you
choose between two different capacitors. Connecting
terminals 13 and 14 adds another resistor to the
circuit.
Build the circuit and set the switch to position B.
Press the key, and leave terminals 13 and 14
unconnected. What kind of sound comes from the
speaker? Now set the switch to A and press the key
another time. Is there any difference in the sound?
Now attach terminals 13 and 14 and press the key.
Try both settings of the switch with terminals 13 and
14 attached and see what occurs.
Which combination gives you the highest tone? The
lowest? What does this show you about how
capacitors and resistors affect each other? Take
meticulous notes about the effects of the different
value capacitors and resistors.
Notes:
EXPERIMENT #64: ADJUSTABLE R-C OSCILLATOR
Wiring Sequence:
1-29
2-30
3-47-110
4-87-89-138
5-101-105-109
13-88
14-90-46-132
48-121
102-131
106-133
119-137
Schematic