Elenco Electronics EP-130 - Morse Code Oscillator with Tone Control

-
13
5-
Do you want to become an amateur radio ham
?
Many radio operators started out usin
g
an oscillato
r
with a tone control like this one. Listenin
g
to the same
tone for a lon
g
time can be very tirin
g
, so the tone
control in this experiment can be very helpful. Simpl
y
connect the wires for this circuit and your cod
e
practice oscillator is ready for use.
Morse Code is a code s
y
stem that uses dots and
dashes, invented by Samuel Morse. The mos
t
effective way to learn Morse
C
ode is to find someon
e
else who is interested in learnin
g
the code. Set up a
schedule and practice every day. Create a pro
g
ress
chart so
y
ou can see
y
our improvement. Take turn
s
sen
di
ng an
d
rece
i
v
i
ng, an
d
i
t won
’
t
b
e
l
ong unt
il
t
he
co
d
e
b
ecomes a
l
most
lik
e a spo
k
en
l
anguage
.
Operatin
g
the key becomes automatic. It takes hard
work to
g
et to this point, but you’ll be proud when yo
u
do.
You can also use different tones to make up
y
our ow
n
special code.
I
f
you want to practice by yoursel
f
simply use th
e
earphone. Disconnect the speaker and connect th
e
ear
ph
one to term
i
na
l
s 27 an
d
28.
N
ow, t
h
e contro
l
ac
t
s
as
a
vol
u
m
e
c
ontrol
as
w
e
ll
as
a
ton
e
c
ontrol. I
f
y
ou want a
f
ixed tone and volume, just replace th
e
control with a
f
ixed resistance.
When you adjust the control
f
or less resistance, th
e
0
.
0
5
μ
F
capacitor charges
f
aster, making the
frequency
(
and the tone
)
higher. The opposit
e
situation occurs when the control is ad
j
usted
f
or mor
e
res
i
stance
.
No
t
es
:
EXPERIMENT #114: M
O
R
S
E
CO
DE
OSC
ILLAT
O
R WITH T
O
NE
CO
NTR
OL
Wiring
S
equence:

1
-29

2-30

3-87-105-109

4-124

5
-41-11
0

85
-
106
-
40
-
2
7

28
-
88

86
-
42
-
13
7

119
-
138

121
-
122
Schematic