Betzold 89211 Mode D'emploi page 52

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189. Warning device against burglary and theft – 1 –
When the circuit has been built, the sound of a spacecraft can be heard
from the loudspeaker (20). When you connect the points A and B (for
example, with connection 3), the sound stops. If you want to use this
against theft, pull a long, thin wire through the object to be protected
(for example, bicycle, motorbike, car, etc.). Connect the two ends of
the wire to the points A and B. When a thief removes the thin wire, the
loudspeaker (20) immediatately sends out an alarm with the sound of a
spacecraft.
190. Warning device against burglary and theft – 2 –
Connect the points A and B (connection 3). Close the slide switch (15).
Music comes from the loudspeaker (20). When the music stops, remove
the connection (3) between the points A and B and the music suddenly
starts again. You can now connect the points A and B using a long, thin
wire.
191. Noise detector
Connect either the points A and B or B and E to the sound transducer
(11). When it becomes too loud, music will now come from the
loudspeaker (20).
192. Tapping-operated musical doorbell
Install the sound transducer(11) in the middle of the door. Using two soft
wires connect it to the points A and B or B and E. Whenever someone
knocks on the door, music comes from the loudspeaker (20).
193. Vibration switch-operated warning device against burglary and theft
Attach the vibration switch (10) to the object to be protected (for
example, door, window, car, motorbike, safe, etc.). Using a wire,
connect the vibration switch to the points A and B or B and E. When the
thief causes a vibration, music comes from the loudspeaker (20).
194. Warning device against burglary and theft with light sensor
Connect the photo-sensor (16) to the points C and D. In darkness the
loudspeaker (20) remains silent. When the thief approaches and light
falls on the sensor (16) or at the beginning of daylight, music comes
from the loudspeaker (20).
195. Baby wet sensor
Connect the humidity switch (12) to the points C and D. When moisture
touches the contact surface, music comes from the loudspeaker (20).
E: Ultra-short Wave Radio
196. Ultra-short wave radio
Close the slide switch (15). Then press the switch "T" to choose
channels.
197. Quiet radio
Connect the resistor (30) to the points A and B and the sound of the
radio changes.
198. Voice amplifier
Connect the sound transducer (11) to the points A and B. Using two
connecting wires, place the the loudspeaker(20) some distance away.
Speak into the sound transducer(11) and the loudspeaker (20) plays
back the words spoken amplified.
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