Elenco Electronics 202 - Manual (Page 111)

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Project #258
OBJECTIVE: To show how electricity can lift things using
magnetism.
Paper Clip Oscillator (IV)
OBJECTIVE: To show how electricity can
lift things using magnetism.
Take a paper clip and straighten it out, bend it in
half, and place it into the electromagnet (M3)
center. Turn on the slide switch (S1), and set the
adjustable resistor (RV) control lever to the right.
The paper clip gets sucked into the center of the
electromagnet and stays suspended there. Move
the adjustable resistor lever to the left, and the
paper clip falls.
Now for the fun part: slowly slide the adjustable
resistor lever until you find a spot where the paper
clip is bouncing up and down. The LED (D1)
flashes and the speaker (SP) makes a clicking
sound.
Drop in
Straighten and
bend paper clip
Project #259
Paper Clip
Oscillator (V)
OBJECTIVE: To learn how electricity and
magnetism are related.
Oscillating
Compass
Use the circuit from project #258, but replace
the 100
μF capacitor (C4) with a 3-snap wire
and replace the speaker (SP) with the 6V
lamp (L2). The circuit works the same way,
but the lamp flashes like a strobe light.
Project #260
Use the circuit from project #258, but replace the
100
μF capacitor (C4) with a 3-snap wire and
replace the speaker (SP) with the 6V lamp (L2).
Place the iron core rod in the electromagnet (M3)
and don’t use the bent paper clip. Slide two
paper clips together, using their loops.
Turn on the slide switch (S1) and hold the paper
clips just above the electromagnet, without them
touching the iron core rod. Watch how the lower
paper clip is drawn toward the iron core rod.
Notice that the lower paper clip is vibrating, due to
the changing magnetic field from this oscillator
circuit. Compare this circuit to project #255 (Paper
Clip Compass).