Owner manual
-1
3
2-
This AM radio station circuit lets you actually transmi
t
your voice throu
g
h the air.
When you completed wirin
g
the circuit, tune your AM
ra
di
o a wea
k
stat
i
on or
pl
ace w
i
t
h
no stat
i
ons.
Pl
ace
the AM radio close to the circuit since the si
g
nal ca
n
only transmitted a few feet. As you talk into th
e
spea
k
er a
dj
ust t
h
e tun
i
ng capac
i
tor, unt
il
you
h
ea
r
y
our voice on the radi
o
Th
e au
di
o s
i
gna
l
s pro
d
uce
d
as you ta
lk
i
nto t
h
e
speaker are amplified by transistor Q1. Thes
e
signals control the amplitude o
f
the RF oscillato
r
s
ig
na
l
.
Th
e antenna an
d
tun
i
n
g
capac
i
tor tune t
h
e
RF
si
g
nal to the settin
g
on your AM radio dial and it i
s
transmitted throu
g
h the antenna
.
The amplitude o
f
the RF signal is controlled b
y
transistor
Q
2. The RF signal is amplified by NP
N
transistor (part of the RF oscillator) before the A
F
(audio frequency) si
g
nal modulates it
.
N
o
t
es:
EXPERIMENT #111: AM RADI
O
S
TATI
ON
Wiring Sequence
:
1
-29
2
-
30
3
-111
5
-7-
90
-
42
-
119
6
-12-47-ANT
8
-
11
-
99
40-112-94
41
-
43
-
93
-7
8
77-44-131
4
5-7
9
8
9-100-46
48-80
1
21-122
1
24-1
3
2
S
chematic