beautypg.com

Project #61, Light-controlled sounds, Project #62 – Elenco Projects 1-101 User Manual

Page 32: Project #63, Project #64, Project #65, Light- controlled sounds (ii), Light- controlled sounds (iii), Light- controlled sounds (iv), Light- controlled sounds (v)

background image

-31-

Project #61

OBJECTIVE: To give a more dramatic demonstration of using
the photosensitive resistance.

Build the circuit shown on the left.

Turn on the slide switch (S1), a police siren is heard. The loudness of
the sound depends on how much light reaches the photoresistor (RP),
try partially shielding it or placing near a very bright light, and compare
the sound.

Light-Controlled Sounds

Project #62

Light-

Controlled

Sounds (II)

OBJECTIVE: To show a
variation of the circuit in
Project #61.

Project #63

Light-

Controlled

Sounds (III)

OBJECTIVE: To show a
variation of the circuit in
Project #61.

OBJECTIVE: To show a
variation of the circuit in
Project #61.

OBJECTIVE: To show a
variation of the circuit in
Project #61.

Project #64

Light-

Controlled

Sounds (IV)

Project #65

Light-

Controlled

Sounds (V)

Modify the last circuit by
connecting points X & Y. The
circuit works the same way but
now it sounds like a machine
gun.

Now remove the connection
between X & Y and then make a
connection between T & U. The
circuit works the same way but
now it sounds like a fire engine.

Now remove the connection
between T & U and then make a
connection between U & Z. The
circuit works the same way but
now it sounds like an
ambulance.

Now remove the connection
between U & Z, add a 1-snap at Z
(on level 3), add a second 3-snap
between V & W (on level 3), and
finally place the music IC (U1)
directly over the alarm IC (U2) on
level 4. Listen to the sounds.

This manual is related to the following products: