Germanium diode radios generally do not perform
well, but they can be important for emergency
communication because they need no power source.
Usually, you can listen to a germanium radio only
through an earphone, but we have added an
operational amplifier to this project so that you can
hear it through the speaker. We are going to make an
IC radio using the dual operational amplifier as a two-
power source, non-inverting amplifier. This is the
simplest way to use this IC.
Slide the switch to position B and assemble the
project. When you complete the circuit, put up the
antenna, 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. To pick up weaker
stations, try using the earphone in place of the
speaker in connections to terminals 1 and 2.
Notes:
EXPERIMENT #114: OPERATIONAL AMPLIFIER RADIO
-135-
Wiring Sequence:
o
1-29
o
2-30
o
3-67-90
o
5-8-11-76-92-26-119-124
o
6-126
o
7-12-ANT
o
27-69
o
28-109
o
63-135
o
68-89-75
o
70-132
o
91-110-125
o
121-131
o
122-134
Schematic
Summary of Contents for EP-130
Page 11: ... 11 I ENTERTAINMENT CIRCUITS ...
Page 26: ... 26 II BASIC SEMICONDUCTOR AND COMPONENTS CIRCUITS ...
Page 36: ... 36 III LED DIGITAL DISPLAY CIRCUITS ...
Page 41: ... 41 IV A TOUR THROUGH DIGITAL CIRCUITS ...
Page 49: ... 49 V MORE ADVENTURES WITH DIGITAL CIRCUITS ...
Page 64: ... 64 VI THE WORLD OF TRANSISTOR TRANSISTOR LOGIC ...
Page 77: ... 77 VII APPLICATION CIRCUITS BASED ON THE OSCILLATOR ...
Page 88: ... 88 VIII BASIC OPERATIONAL AMPLIFIER CIRCUITS ...
Page 116: ... 116 IX MORE ADVENTURES WITH OPERATIONAL AMPLIFIERS ...
Page 129: ... 129 X COMMUNICATION CIRCUITS ...