The “R-C” in this project’s name stands for
resistance-capacitance. We’ve seen how varying
resistance and capacitance can affect the pulsing
action of an oscillator. This project lets us see the
effects when we change the strengths of both
resistors and capacitors.
Look at the schematic. You can see the switch
allows you to choose between two different
capacitors. You can add a second resistor to the
circuit by connecting terminals 13 and 14.
After you build the project, set the switch to position
B. Leave terminals 13 and 14 and press the key.
What kind of sound do you hear from the speaker?
Now set the switch to A and press the key again. Is
there any change in the sound? Now connect
terminals 13 and 14 and press the key. Try both
settings of the switch with terminals 13 and 14
connected and see what happens.
Which combination gives you the highest tone? The
lowest? What does this tell you about how
capacitors and resistors affect each other? Take
careful notes about the effects of the different value
capacitors and resistors.
Notes:
EXPERIMENT #60: VARIABLE R-C OSCILLATOR
Wiring Sequence:
o
1-29
o
2-30
o
3-47-110
o
4-87-89-138
o
5-101-105-109
o
13-88
o
14-90-46-132
o
48-121
o
102-131
o
106-133
o
119-137
-78-
Schematic
Содержание EP-130
Страница 11: ... 11 I ENTERTAINMENT CIRCUITS ...
Страница 26: ... 26 II BASIC SEMICONDUCTOR AND COMPONENTS CIRCUITS ...
Страница 36: ... 36 III LED DIGITAL DISPLAY CIRCUITS ...
Страница 41: ... 41 IV A TOUR THROUGH DIGITAL CIRCUITS ...
Страница 49: ... 49 V MORE ADVENTURES WITH DIGITAL CIRCUITS ...
Страница 64: ... 64 VI THE WORLD OF TRANSISTOR TRANSISTOR LOGIC ...
Страница 77: ... 77 VII APPLICATION CIRCUITS BASED ON THE OSCILLATOR ...
Страница 88: ... 88 VIII BASIC OPERATIONAL AMPLIFIER CIRCUITS ...
Страница 116: ... 116 IX MORE ADVENTURES WITH OPERATIONAL AMPLIFIERS ...
Страница 129: ... 129 X COMMUNICATION CIRCUITS ...
Страница 136: ... 136 XI TESTING AND MEASURING CIRCUITS ...