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BACK
to Intro to Electronics
More
about diodes, BJT, JFET, Photodetectors, Inductors and Transformers and such!
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You need to review this site
Electronic
symbols. Later you will have to draw a schematic/block
diagram using such symbols
from a power supply that you will reverse engineer.
This is a
sample of a schematic diagram. Do a search and locate a
block diagram of some electronic or system automation. Provide the URL where
you found one.
Research:
What is a BJT? (not just what the
acronym stands for but what is it?)
What is a FET? (not just what the acronym stands for but what is it?)
How is a BJTand FET
different?
What
is MOSFET? (not just what the acronym stands for but what is it?)
What is a JFET? (not just what the acronym stands for but what is it?)
Review the following sites for an
explanation. Also be prepared to discuss this
in class.
Sites to search for answers.
Allied
Electronics
Mouser Electronics
Texas
Instruments
BJT
Configurations
Bipolar
Junction Transistor (BJT)
Transistors
MOSFET
JFET
Operation
3. What is a Diode?
How is a typical diode constructed?
What is a
tunnel
diode?
What is an
LED?
What
is a Schottky
diode?
What is a voltage variable capacitor diode (Varactor
Diode)?
Use these sites to seek the answers to these questions to be discussed in class.
Allied
Electronics
Mouser Electronics
Diode
Operation Illustration
Diode Theory
of Operation
More sites on Diodes
http://www.pbs.org/transistor/science/info/diodes.html
http://hyperphysics.phy-astr.gsu.edu/hbase/solids/diod.html
http://www.powerdesigners.com/InfoWeb/design_center/articles/Diodes/diodes.shtm
Laser diodes
4. What is UJT?
How is it different from a Bipolar Transistor?
Be sure to
reference your text as well.
Comparison of a
Transistor to a UJT
5. Explain how to test a 7 segment display.
7 segment
Be able to field test a segment display component to
determine if it common cathode or common anode.
6. Explain in writing what inductors are and
what they maybe used for.
Be able to test an inductor for proper operation.
Inductor
Theory
8. Explain in writing the
principle of operation of a transformer.
Transformer
principles
Transformer
Basics
Transformer
Conversions
9. What is a
zener
diode?
What is it used for?
10.
What is a
SCR?
(not just what the acronym stands for but what is it?)
What is it used for?
11. What is a
heat
sink?
12.
What is a
full
wave rectifier?
What is it used for?
13. Quiz:
You should be able to identify these devices.
| Transistors |
7 segment display |
Relay |
SCR |
| JFET |
Inductor |
Capacitor |
coil |
| UJT |
heat sink |
Potentiometer |
IC Voltage Regulator |
| Diode |
Transformer |
Rheostat |
Solenoid |
| Zener diode |
Full wave rectifier |
Thermistor |
micro switch |
| Tunnel diode |
Motor |
Photoresistor |
BJT |
- I will pass out to each student a specific device that needs to be identified.
You are expected to share verbally (visually) what you have found out
about your device with the class.
- There will be a time when you need to replace an electronic a part that is
defective in some manner .. burnt out or just failed and has to be replaced.
What is the part ... how does it work ... what may substitute for the part if
anything? How would you go about finding out all about the part? answer
... research. Where would you research?
More useful information for class Activities
You will be testing a UJT for a lab activity. This site may
be helpful for you in doing that activity.
Testing a UJT
Testing a transistor using analog or
digital meter:
Transistor
testing
This site will be useful to you as a
resource when reading the text photodetector activity.
Opto
resource site
Additional Resources:
Review this resource site;
Resources
for more on this units topic as well as additional information.
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