Task 5: (Due TUESDAY 02/22/2005)
Objective: Students will have a vivid idea of the hardware/software parts they are
interested in pursuing for their senior design projects.
In this task, you are required to select some software or hardware component that is
probably needed for your project. If you choose a hardware part, it should be ordered by
the time Task 4 is due. Since this is an individual task, you should record your discussion
on the component/part you’ve chosen in your engineering notebook and turn it in as a
hardcopy.
As mentioned earlier, there are two options to this task, i.e., hardware or software
selection. The outlines for each option are provided below for guidance purposes. NOTE:
Please indicate which option you’ve decided on.
Option A: Hardware component
¾ Explain why you choose this part/component for the project.
¾ Include simple schematic diagram of your test circuit
¾ In addition, include information such as the vendor name, contact number and
website of each company that supplies the component or a possible test
circuit.
WARNING: If you order a part, make sure it is DIP style package and not
surface mount; else, it will not fit into a conventional breadboard unless it is
pre-mounted on a special device.
Option B: Software component
¾ Explain why you choose this part/component for the project.
¾ Write a simple function pertaining to your design project using the chosen
software
¾ Then, document your function with either a flow chart or a state chart
NOTE: FYI, there are many electronic circuit handbooks in the Engineering Library
which might be helpful for your design project. Try searching for the Encyclopedia of
Electronic Circuits in the Reference section.
Brief Example of Task 5:
I have chosen Option A. The hardware component I’m interested in is a basic
operational amplifier (op amp). The reason I decided on this component is that our
design project demands the construction of a band pass filter to reject certain input
signals with low and high frequencies (which may be purely noise) that might interfere
with the desired signals at some intermediate frequency. In addition, the group members
and I decided that since I have the most experience in analog circuits, I should be in
charge of this section.
To my knowledge, the simplest band pass filter can be built by combining the first
order low pass and high pass filters; thus, only one op amp is needed. Referring to
Figure 1, the circuit will attenuate low frequency (ω << 1/(R1C1)) and high frequency (ω
>> 1/(R2C2)) signals, but will only pass intermediate frequencies that have a gain of
R2/R1. It must be noted that this test circuit cannot be used to generate a filter with very
narrow band.
C2
R2
Vin
C1
R1
X1
Vout
Figure 1: Simple band pass filter schematic diagram
We can obtain op amps from different sources which include:
1. Component: LF347N
Description: 14 pin wide bandwidth quad JFET operational amplifier
Vendor: Jameco
Contact no: (800) 831-4242
Website: www.jameco.com
Email: domestic@jameco.com
2. Component: LF347N
Description: 14 pin wide bandwidth quad JFET operational amplifier
Vendor: National Semiconductor
Contact no: (800) 272-9959
Website: www.national.com
3. Component: LF347N
Description: 14 pin wide bandwidth quad JFET operational amplifier
Vendor: Texas Instrument
Contact no: (765) 457-7241 (Schillinger Associates Inc. (SAI)-Distributor in
Eastern and Western Kentucky)
Website: www.ti.com, www.ti-estore.com