Elenco Electronics EP-130 - EXPERIMENT #109: OPERATIONAL AMPLIFIER AM RADIO

-
130
-
In emer
g
ency situations when there is no power,
a
g
ermanium diode radio can be used. Generally the
y
do not perform well and limited to using and crysta
l
earphone since they have no power source.
In this circuit, we will use an operational amplifier so
you can hear the radio throu
g
h the speaker. Thi
s
s
im
p
le I
C
radio uses the dual o
p
erational am
p
lifier a
s
a
two-power source, non-inverting ampli
f
ier.
S
lide the switch to position B and assemble the
experiment. A
f
ter wiring the circuits put up the
a
ntenna and connect it to the circuit.
S
et the control
to the 12 o’clock position and slide the switch to
p
osition A to turn on the power. Turn the tunin
g
c
apac
i
tor unt
il
you
h
ear a stat
i
on.
Y
ou can try p
i
c
ki
ng
up weaker stations, by using the earphone in place o
f
the speaker in connections to terminals 1 and 2
.
No
t
es
:
EXPERIMENT #1
09
:
O
PERATI
O
NAL AMPLIFIER AM RADI
O
Wirin
g
Sequence
:

1
-
29

2
-
30

3-67-9
0

5
-
8
-
11
-7
6
-
92
-
26
-
119
-
124

6
-12
6

7-12-AN
T

27-6
9

28-10
9

63-13
5

68
-
89
-7
5

7
0
-
132

9
1-11
0
-12
5

121
-
131

122-1
34
Schematic