Elenco 130-in-1 Electronics Playground - Manual (Page 130)

-130-
In emergency situations when there is no power, a
germanium diode radio can be used. Generally they
do not perform well and limited to using and crystal
earphone since they have no power source.
In this circuit, we will use an operational amplifier so
you can hear the radio through the speaker. This
simple IC radio uses the dual operational amplifier as
a two-power source, non-inverting amplifier.
Slide the switch to position B and assemble the
experiment. After wiring the circuits put up the
antenna and connect it to the circuit. Set the control
to the 12 o’clock position and slide the switch to
position A to turn on the power. Turn the tuning
capacitor until you hear a station. You can try picking
up weaker stations, by using the earphone in place of
the speaker in connections to terminals 1 and 2.
Notes:
EXPERIMENT #109: OPERATIONAL AMPLIFIER AM RADIO
Wiring Sequence:
1-29
2-30
3-67-90
5-8-11-76-92-26-119-124
6-126
7-12-ANT
27-69
28-109
63-135
68-89-75
70-132
91-110-125
121-131
122-134
Schematic