Elenco Snap Circuits Motion - Manual (Page 68)

Project 135 Lazy Fan
Set the adjustable resistor (RV2) to the top setting and
keep it there. Turn on the slide switch (S1). The fan on
the light motor (M7) spins briefly and stops. Now turn
off the slide switch, wait a little while, and then turn it
back on. The fan spins briefly again. Try this several
times.
It is as if the fan is lazy, and can only spin a short time
before it gets tired and has to stop and rest.
Project 136
Lazy Merry-
Go-Round
Use the preceding circuit but replace
the light motor (M7) with the geared
motor (GM, “+” on top). Install
cardboard figures in the merry-go-
round base and place the base on
the geared motor. The circuit works
the same way but spins the merry-
go-round instead of the fan.
Project 137 Lazy Lights
Set the adjustable resistor (RV2) to the top setting.
Turn on the slide switch (S1). The LEDs (D8 & D10)
light for a few moments. Now turn off the slide
switch, wait a little while, and then turn it back on.
The LEDs light briefly again. Try this several times.
It is as if the LEDs are lazy, and can only light for a
short time before they get tired and have to turn off
and rest.
Try this with different settings for RV2.
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When you turn on the slide
switch, the fan spins while the
100mF capacitor (C4) charges
up, then stops. When you turn
off the slide switch, the capacitor
takes about 20 seconds to fully
discharge.
Project 138
Very Lazy
Lights
Use the preceding circuit but replace
the 100mF capacitor (C4) with the
much smaller 1mF capacitor (C7).
Now the LEDs only flash for a brief
moment, because C7 can’t store as
much electricity as C4 did.
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