ee 1202 labs: ground rulesdodge/ee1202/brief1.pdf · erik jonsson school of engineering and...
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Erik Jonsson School of Engineering and Computer Science
The University of Texas at Dallas
© N. B. Dodge 01/12
EE 1202 Labs: Ground Rules
• There are eight lab exercises that you will do as a part of EE 1202.
• The EE 1202 lab is ECSS 4.622, on the third floor of the ECSS building.
• Lab exercises will be done by teams of two students, working together.
• You will do these labs on your own, at your own rate. • There are no scheduled lab times. Go to the lab and do
your lab work when you wish (subject to lab open hours).
EE 1202 Lab Briefing #1 1
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Erik Jonsson School of Engineering and Computer Science
The University of Texas at Dallas
© N. B. Dodge 01/12
Reserving a Lab Position
• Reserving a lab is simple: – Go to ECSS 4.622 during open hours (11:30 AM-8:30 PM, M-R,
or on Friday, 11 AM to 12 Noon). – Sign up on the reservations list for a lab position and time.
Reservations are available in 2-hour slots. The Friday hour is only for signing up for next week’s slots.
– At the reserved time, come to the lab and do the exercise. If you do not finish in two hours, you must reserve another slot.
– After completing the lab, write your lab report and turn in on the due date in class.
EE 1202 Lab Briefing #1 2
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Erik Jonsson School of Engineering and Computer Science
The University of Texas at Dallas
© N. B. Dodge 01/12
Lab Facilities
• Supplies needed for EE 1202 labs (except for the electronic kits) are in the EE 1202 supply cabinet.
• The EE 1202 supply cabinet is on your left as you enter the lab.
• Plywood solder boards are just right of the three lab cabinets.
• You are responsible for getting supplies as needed from the cabinet for each lab, for replacing them when done, and for cleaning up your work area.
EE 1202 Lab Briefing #1 3
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Erik Jonsson School of Engineering and Computer Science
The University of Texas at Dallas
© N. B. Dodge 01/12 EE 1202 Lab Briefing #1 4
Building a Simple Electronic Circuit
• Each year, billions (yes, BILLIONS) of printed circuit boards are built, so it is worthwhile to understand the basic principles of PCB assembly.
• Lab #1 is an exercise in building a simple PCB light blinker kit. As with all EE 1202 lab exercises, you will do this on your own in the EE 1202/2310 lab, which is ECSS 4.622.
• While in the lab, there will be a teaching assistant on duty, who can provide advice about the lab exercise. However, it is your responsibility to do the lab work.
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Erik Jonsson School of Engineering and Computer Science
The University of Texas at Dallas
© N. B. Dodge 01/12
Light Blinker Circuit and PCB
• The assembled light blinker circuit is shown to the right.
• You and your partner will each build a circuit.
• Follow instructions in the kit plus additional tips in your lab book (some tips follow).
• Examine the blank PCB. One side has copper wires; the other a printed parts outline.
EE 1202 Lab Briefing #1 5
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Erik Jonsson School of Engineering and Computer Science
The University of Texas at Dallas
© N. B. Dodge 01/12
Preparing the Soldering Iron
• Plug in the soldering iron. • Turn on bench power. • Iron should heat in ~ 5
minutes. • Clean off tip with wire
cleaner. • “Tin” Solder tip as shown. • Repeat clean/tin cycle during
soldering as required.
EE 1202 Lab Briefing #1 6
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Erik Jonsson School of Engineering and Computer Science
The University of Texas at Dallas
© N. B. Dodge 01/12
Practice Soldering Board
• Attach a practice solder board to the “third hand.”
• Clip several 4-5” pieces of solid wire from the spool provided.
• Strip pieces ¼” from end. • Insert into hole on board so
that stripped end protrudes from copper side.
• Solder several pieces. EE 1202 Lab Briefing #1 7
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Erik Jonsson School of Engineering and Computer Science
The University of Texas at Dallas
© N. B. Dodge 01/12
Soldering Technique
• Apply hot iron to wire and copper on board simultaneously.
• Let heat for ~ 1 second. • Touch solder to junction of wire
and board. • When solder flows, apply no more
than ½ inch length of solder. • Remove solder and let iron stay in
contact with junction about ½ sec. • Remove soldering iron. Junction
will solidify almost instantly.
EE 1202 Lab Briefing #1 8
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Erik Jonsson School of Engineering and Computer Science
The University of Texas at Dallas
© N. B. Dodge 01/12
Quality of Soldering Joint
• A good soldering joint will be shiny; the surface will be concave around the wire.
• A “cold solder joint” will be fuzzy-looking. Such a joint is not a good connection and must be re-soldered.
EE 1202 Lab Briefing #1 9
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Erik Jonsson School of Engineering and Computer Science
The University of Texas at Dallas
© N. B. Dodge 01/12
Correcting a Solder Joint
• A badly-soldered connection must be re-heated.
• Touch the soldering iron to the junction until solder melts.
• Leave soldering iron in contact for a short (~1/2 sec.) time after solder melts in joint.
• Remove soldering iron and let solder set.
• Check joint – it should be concave around the wire and shiny.
EE 1202 Lab Briefing #1 10
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Erik Jonsson School of Engineering and Computer Science
The University of Texas at Dallas
© N. B. Dodge 01/12
Building the Circuit • Remove parts and inventory using
included list. • Start with resistors. Insert them so
that color code lines up – easier to check (color code in manual).
• Use kit information to select each resistor for placement.
• Insert from back (picture) side. • Bend leads to hold in place. • Clip leads to ¼ inch. • With all resistors in place, give to
partner to check placement.
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Erik Jonsson School of Engineering and Computer Science
The University of Texas at Dallas
© N. B. Dodge 01/12
Building the Circuit (2) • When resistors are checked by
partner, solder in place. • Follow up with other components by
type, inserting, checking, and then soldering.
• Be careful with capacitors and LED’s, which are polarized, and must be connected in the correct direction.
• Potentiometers and transistors also must be soldered in correctly, but their wire arrangements are shown correctly on the picture side of the board. EE 1202 Lab Briefing #1 12
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Erik Jonsson School of Engineering and Computer Science
The University of Texas at Dallas
© N. B. Dodge 01/12
Removing an Incorrectly-Placed Part • If a part is placed incorrectly, you will
need to remove it, using the “solder sucker” or solder wicking tools.
• Heat junction until liquid, then use the solder sucker to remove solder.
• Do not heat junction too long, or the copper etched wires could become delaminated.
• You will need to heat each junction several times to remove all the solder.
• Use the wicking tool to remove the final bits of solder. Heat once more, wiggle lead with needle-nose pliers, and remove.
EE 1202 Lab Briefing #1 13
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Erik Jonsson School of Engineering and Computer Science
The University of Texas at Dallas
© N. B. Dodge 01/12
Building the Circuit (3)
• Add the battery connector last. • When you have finished the
soldering, connect the battery. • If the circuit is correctly
assembled, the LED lights should immediately begin to blink.
• Using the potentiometers, adjust the blinking rate and finish the exercise as directed in the lab manual.
EE 1202 Lab Briefing #1 14
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Erik Jonsson School of Engineering and Computer Science
The University of Texas at Dallas
© N. B. Dodge 01/12
Writing the Lab Report • When you are finished, write the lab report, using the
report outline. • Look over the example report to get an idea of what is
expected. • Lab partners submit only one report. • Partners should alternate writing the report. • Your lab reports represent one-half of your EE 1202
grade. Please make sure that you do the lab exercises carefully and work diligently to create an informative, readable lab report.
EE 1202 Lab Briefing #1 15