Elenco Upgrade Kit SC300 to SC750 - Manual (Page 35)

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Project #392
OBJECTIVE: To build a light-sensitive police car sound.
As long as the photoresistor (RP) is exposed to light, the alarm IC (U2)
outputs a signal to the speaker (SP). Block the light with your hand
and the sound will stop.
Daytime Light
Police Car
OBJECTIVE: To build a light-sensitive
machine gun sound.
Use the circuit from project #392. Connect the
jumper wire to points B & C. The sound of a
machine gun will be heard when the room is
not dark.
Daytime Light
Machine Gun
Project #393
OBJECTIVE: To build a light-sensitive fire
engine sound.
Daytime Light
Fire Engine
Project #394
OBJECTIVE: To build a light-sensitive
ambulance sound.
Daytime Light
Ambulance
Project #395
Use the circuit from project #392. Connect the
jumper wire to points A & B for a fire engine
sound, when room is not dark. Use the circuit from project #392. Connect the
jumper wire to points A & D for an ambulance
sound.