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21
Turn on the slide switch (S1) and tap the whistle chip (WC), it makes a machine
gun sound (with music in the background). Thoroughly cover the photoresistor
(RP) with your hand and the sound becomes a siren. After a while the sound will
stop, tap the whistle chip and it resumes.
Press the press switch (S2) and the LED (D1) lights, but the lamp (L1) does not
light and the motor (M1) does not spin. Electricity is owing through the lamp
and motor, but not enough to turn them on. So in this circuit they are acting like
3-snap wires.
Project #33
Using Parts as Conductors
OBJECTIVE: To show that motors and lamps may sometimes be used as
ordinary conductors.
(STANDING)
Project #34
Setup: Cut out a circular piece of thin cardboard from the back of an old spiral
notebook or note pad. Use the fan blade as a guide. Place the fan on the
cardboard and trace around it with a pencil or pen. Cut the cardboard out with
scissors and tape it to the fan blade. Do the same thing with a piece of white
paper, but tape the paper on top of the cardboard so it can be removed easily later.
Drawing: To make a ring drawing obtain some thin and thick marking pens as
drawing tools. Spin the paper by pressing and holding press switch (S2) down.
Press the marker on the paper to form rings. To make spiral drawings, release
press switch and as the motor (M1) approaches a slow speed move the marker
from the inside outward quickly.
Change the colors often and avoid using too much black to get hypnotic effects.
Another method is to make colorful shapes on the disc then spin the disc and
watch them blend into each other. When certain speeds are reached under
uorescent lights without electronic ballasts, the strobe principle shown in another
project will produce strange effects and backward movement. Make a wheel
with different colored spokes to see this strange effect. Adding more spokes and
removing spokes will give different effects at different motor speeds.
Spin Draw
OBJECTIVE: To produce circular artistic drawings.
Thin Cardboard White Paper
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