Elenco Deluxe Snap Rover&reg - Manual (Page 42)

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Project #60 Little Bully
Project #59
OBJECTIVE: To show how capacitors slow things down.
Big Bully
Build the circuit, place the base grid on the Rover
body, and connect the jumper wires as shown. Push
the press switch (S2) and the white LED (D4) is on,
release the switch and the LED goes out slowly.
Electricity stored in the 100
μ F capacitor (C4N)
keeps the LED on after the batteries have been
disconnected.
Turning on the slide switch (S1) places the small
1
μ F capacitor (C7) in parallel with the 100 μ F, which
has no visible effect. Capacitors can store electricity
similar to how water tanks can store water, so
placing a small water tank next to a big one doesn’t
matter - the big one dominates.
If you remove the 100 μ F capacitor, the LED will turn
off immediately when the switch is released.
OBJECTIVE: To compare how capacitors work when connected
in series.
This is the same circuit as the preceding project, but
with the capacitors connected differently. Build the
circuit and connect the jumper wires as shown.
Push the press switch (S2) several times with the
slide switch (S1) either on or off, watching how
quickly the white LED (D4) turns off.
With the slide switch on the LED turns off
immediately when you release the press switch. The
slide switch places the small 1
μ F capacitor in series
with the large 100 μ F capacitor (C4N). In this
arrangement, electricity flows into both capacitors
but stops as soon as one is full. The small capacitor
fills up quickly, so it dominates the big one. The
electricity stored in the capacitors is released to the
LED when the press switch is released.
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