Elenco Projects 102-305 - Manual (Page 13)

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OBJECTIVE: To build a police siren with light.
Turn on the slide switch (S1). A police siren is heard and the lamp
(L1) lights.
Project #114
More Light &
Sounds
OBJECTIVE: To show a
variation of the circuit in
project #113.
Modify the last circuit by
connecting points X & Y. The
circuit works the same way but
now it sounds like a machine gun.
OBJECTIVE: To show a
variation of the circuit in
project #113.
Project #116
More Light &
Sounds (III)
OBJECTIVE: To show a
variation of the circuit in
project #113.
Project #117
More Light &
Sounds (IV)
OBJECTIVE: To show a
variation of the circuit in
project #113.
Project #113 Light & Sounds
Project #115
More Light &
Sounds (II)
Now remove the connection
between X & Y and then make a
connection between T & U. Now
it sounds like a fire engine. Now remove the connection
between T & U and then make a
connection between U & Z. Now
it sounds like an ambulance.
Now remove the connection
between U & Z, then place the
470
μ F capacitor (C5) between T
& U (“+” side to T). The sound
changes after a few seconds.
To learn more about how circuits work, visit www.snapcircuits.net or page 74 to find out about our Student Guides.