Elenco Snap Circuits SOUND &reg - Manual (Page 82)

Build the circuit and turn on the right switch (S1). Press
one key in a series of long and short bursts with pauses
in between, and use Morse Code to send secret
messages to your friends.
You can use the difference in pitch between keys to send
messages to different people. For example, sending
Morse Code with the blue C key can mean that the
message is for one friend, using the green C key can
mean it’s for someone else, the green B key can be
someone else. Turn on the left slide switch makes the
pitch of the green keys much different, so can be used to
identify messages for additional friends.
Morse Code: The forerunner of today’s telephone system
was the telegraph, which was widely used in the latter half
of the 19th century. It only had two states - on or off (that is,
transmitting or not transmitting), and could not send the
range of frequencies contained in human voices or music. A
code was developed to send information over long distances
using this system and a sequence of dots and dashes (short
or long transmit bursts). It was named Morse Code after its
inventor. It was also used extensively in the early days of
radio communications, though it isn’t in wide use today. It is
sometimes referred to in Hollywood movies, especially
Westerns. Modern fiber optics communications systems
send data across the country using similar coding systems,
but at much higher speeds. Indian tribes sometimes used
smoke signals to send messages. MORSE CODE
A . _
B _ . . .
C _ . _ .
D _ . .
E .
F . . _ .
G _ _ .
H . . . .
I . .
J . _ _ _
K _ . _
L . _ . .
M _ _ N _ .
O _ _ _
P . _ _ .
Q _ _ . _
R . _ .
S . . .
T _
U . . _
V . . . _
W . _ _
X _ . . _
Y _ . _ _
Z _ _ . . Period . _ . _ . _
Comma _ _ . . _ _
Question . . _ _ . .
1 . _ _ _ _
2 . . _ _ _
3 . . . _ _
4 . . . . _
5 . . . . .
6 _ . . . .
7 _ _ . . .
8 _ _ _ . .
9 _ _ _ _ .
0 _ _ _ _ _
Project 181 Morse Code
-81-