Project #680, Alarm vibrator w/ led, Project #681 – Elenco Projects 512-692 User Manual
Page 80: Alarm vibrator w/ led (ii)

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Project #680
OBJECTIVE: To show how electricity can move things using
magnetism.
Alarm Vibrator w/ LED
Take a paperclip and straighten it out, bend it in
half, and place it into the electromagnet (M3)
center. Turn on the slide switch (S1), and the
paperclip should vibrate and LED (D1) flashes.
Now press the press switch (S2), the paperclip is
sucked up by the electromagnet and a siren
alarm sounds.
You can replace the speaker (SP) with the whistle
chip (WC) to change the sound.
Drop in
Straighten and
bend paperclip
Project #681
OBJECTIVE: To show how electricity can move things using
magnetism.
Alarm Vibrator w/ LED (II)
Take a paperclip and straighten it out, bend it in
half, and place it into the electromagnet (M3)
center. Turn on the slide switch (S1), and the
paperclip should vibrate.
Now press the press switch (S2), the paperclip is
sucked up by the electromagnet and the LED
(D1) flashes.
Drop in
Straighten and
bend paperclip