-29-
The capacitors are some of the handiest items in
your kit. They can store electricity, smooth out
pulsing electricity into a steady flow and let some
electric current flow while blocking other current.
This lets you hear the effects of capacitors
connected in series and parallel.
When you finish wiring this project, set the switch to
B. Then, connect terminals 13 and 14. You’ll hear a
sound from the speaker. In this case, electricity is
flowing through the 0.01
μ
F capacitor (refer to the
schematic while we talk about this). Now press the
key. What happens?
You hear a lower-pitched sound from the speaker.
This is because the 0.05
μ
F capacitor has been
added in parallel to the first capacitor. That is, the
current flows through both capacitors at the same
time, through two separate channels. What do you
think happens to the total capacitance when you
connect two capacitors in parallel?
You might have guessed wrong. When two
capacitors are connected in parallel, the total
capacitance increases. The increased capacitance
causes the tone to be lower.
Now release the key and move the switch from B to
A, but do not press the key while the switch is set to
A. (The transistor can be damaged.) What do you
hear?
You hear a high-pitched sound from the speaker.
This is because the 0.05
μ
F and 0.01
μ
F capacitors
are not connected in series - current flows from one
directly to another. The total capacitance in the
circuit is now less than the smallest capacitor
making up the series connection. This lower
capacitance allows the more high-pitched sound.
Notes:
EXPERIMENT #16: CAPACITORS IN SERIES AND PARALLEL
Wiring Sequence:
o
1-29
o
2-30
o
3-91-110-132
o
4-121
o
5-41-109
o
13-42
o
14-119
o
40-92-101-137
o
102-106-133
o
105-131-138
o
13-14 (POWER)
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 ...