Elenco Fiber Optics Voice and Data Kit - Manual (Page 7)

-6-
TESTING PROCEDURE
QUIZ 1
Answ ers: 1. tr ansmitter, fiber optic cab le , receiv er; 2. electrical, light; 3. light;
4. light, electr ical; 5. voice , electr ical; 6. IO; 7. 4.5; 8. current; 9. battery ; 10. noise
1. Connect a 9 volt battery to the battery holder.
2. Switch S2 to the 1kHz position (toward LED D2)
and S1 on (toward LED D1). Observe that LED
D1 and D2 are on.
3. If you have a voltmeter, measure the DC voltage
on pins 2, 3, and 6 of the IC. All of these voltages
should be 1/2 the battery voltage.
4. If you have an oscilloscope, connect it to test
point TP. Switch S2 in the 1kHz position (toward
LED D2) to place C4 in the circuit. You should see
a 6V peak-to-peak square wave of about 1kHz on
the scope.
5. Switch S2 to the mic position (toward the
battery), speak into the microphone and observe
your voice waveform on the scope.
If you experience any problems, see the
Troubleshooting Guide on page 20.
1. The FO-30 Kit consists of three basic elements
that are found in every fiber optic link. They are
_____________, _____________, and
_____________.
2. The function of the transmitter is to convert an
_____________ signal into a _____________
signal.
3. The function of the fiber optic cable is to transmit
a _____________ signal from the transmitter to
the receiver.
4. The receiver accepts a _____________ signal
and converts it back to an _____________
signal.
5. The microphone picks up a _____________
signal and converts it to an _____________
signal.
6. The gain of the LM-741 is equal to
_____________.
7. The DC output to the op-amp is _____________
volts.
8. The NPN transistor (3904) controls the
_____________ through the LED.
9. The LED (D1) indicated the state of the
_____________.
10. C2 filters out any _____________ that comes
through the voltage divider.
Screws and Nuts
Mount the two screws in the position as shown in the
pictorial diagram. Place the nuts on the screws and
tighten them from the back side of the PC board.
9V Battery Holder
Solder the 9V battery holder to pad
J1 and J2 in the correct position as
shown in the pictorial diagram.
To point marked
TP on PC board
GND & TP - Test Point
To point marked
GND on PC board