Elenco Deluxe Snap Rover® - Manual (Page 41)

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Project #58
OBJECTIVE: To use capacitors like resistors to control the
volume of sound.
Frequency Resistors
Build the circuit and connect the jumper wires as
shown. You hear a tone, use the switches (S1 and
S2) to adjust the volume.
Turning on the switches diverts some electrical
energy away from the speaker, reducing the volume
of the sound. Compare how loud the sound is with
different parts in the circuit, try one at a time using
the swtiches. Compare the sound with the
capacitors to the sound with the resistors and 3-
snap wire.
Use the knobs on the sound & recording IC (U9) if
you want to change the tone.
R
O
VER REAR
Parts in the circuit: Parts you can
replace them with:
Capacitors can store electrical energy for short periods of time, an ability which
results in them having high resistance to a constant voltage but lower resistance to a
changing voltage. For the low-frequency sounds produced by the sound & recording
IC (U9), the 1
μ F capacitor (C7) has about as much resistance as the 100 Ω resistor
(R1) while the 100 μ F capacitor (C4N) has almost no resistance (like the 3-snap wire).