Data Sheet

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262. Magnet-controlled Fire Siren with Red Light Warning
Replace the switch (62) in project #257 with the reed switch (83), hold
the magnet (7) near the reed switch (83) and you will hear some low
volume sounds of a police siren from the speaker (93). Also, you will see
the heart LED (69) is ashing at the same time. The reason the volume
is low is because the heart LED (69) has resistance built into it which is
limiting the current through the speaker (93).
263. Magnetic Field of a Magnet
Connect points C and D with a 4-wire (4) in project #262, hold the magnet
(7) near the reed switch (83) and you will hear gun shots in low volume and
the heart LED (69) with ash at the same time. Iron lings can be used to
show magnetic elds created by magnets (such as in the picture below).
264. Visual & Audio Warning
Connect points A and B with a 4-wire (4) in project #262, hold the
magnet (7) near the reed switch (83) and you will hear a re siren
in low volume and the heart LED (69) will icker at the same time.
Police cars, re trucks and re engines all provide both audio and visual
warnings in case of emergency.
265. Proximity Warning of an Alien Space Craft
Connect points E and F with a 4-wire (4) in project #262. Hold the
magnet (7) near the reed switch (83) and the sounds of space battle
will turn on in low volume with the heart LED (69) ashing with each
sound. This simulates a proximity warning from an alien space craft.
266. Surprise Birthday Song
Connect points G and H with a 4-wire (4) in project #262. Hold the
magnet (7) near the reed switch (83) and you will hear music in low
volume and the heart LED (69) will dance to the music. On your friend’s
birthday, setup this circuit and tell them to hold the magnet (7) near the
reed switch (83) for a surprise!
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