Elenco Green Projects - Manual (Page 57)

Hand Noise
Project #87 Hand Lights
The electricity produced by the
hand crank is unstable, due to the
design of the motor inside it and
because you can’t turn the crank
in a steady manner. The 470
μF
capacitor (C5) acts like a filter to
stabilize the electricity, which
makes the horn work better.
Set the meter (M6) to the 5V setting
and turn the hand crank (HC).
Turning clockwise will light the yellow
LED (D4) while the meter shows the
voltage produced. Turning counter-
clockwise produces electricity flow in
the opposite direction, so the red
LED (D1, pointing the other way)
lights.
You can probably turn the crank fast
enough to measure more than 5V on
the meter. Remove the 2-snap wire
across base grid locations C2-C3 on
level 3. This puts a 10K
Ω resistor in
the pivot stand in series with the
meter, changing its voltage scale.
Now turn the hand crank but double
the voltage shown on the meter (so
4V is really 8V).
Project #88
Turn the hand crank (HC) clockwise.
The horn (W1) makes noise. Push
the press switch (S2) at the same
time to make the sound louder.
If you are out in the wilderness, you
can use a hand crank and horn to
sound an alarm.
+
The hand crank has a
gearbox, which allows a motor
in it to spin faster and with less
force than you turn the crank.
The faster the motor spins, the
more electricity is produced.
5V
-56-