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7/28/2019 06 Soldering 101 (PPTmin)
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Colorado Space Grant Consortium
Gateway To SpaceASEN / ASTR 2500
Class #06
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- Special guest to the class
- Soldering 101
- SUNDAY, SUNDAY, SUNDAY
AVR SMACKDOWN!!!
3:00 PM9:00 PM
- Need helpers for set up 1:30 PM
- Need helpers for tear down 9-10 PM- Not every will enjoy Sunday
- Next class 9/15/09, Guest Lecture
Julia Chu, Lockheed MartinSystems Engineering
Today:
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Colorado Space Grant Consortium
Soldering 101
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Soldering:
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Caution:
- Solder ing is dangerous if not respected
- Be mindful of where you are and where
the solder ing iron is
- Eyes and l iquid solder
- Everyone is expected to solder
-If you get burned
-Stay together, dont work ahead
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Soldering
Circuit Board
Resistor
Solder Pads
Side View
Top View
PCBprinted circuit boards
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Prep Step 4: Tinning the iron
- Tin the tip of the soldering
iron by melting an inch or soof solder on the tip.
- The iron will now look shiny
on the tip.
- Then wipe any excess solder
on the golden sponge.
- Now place the iron back into
the holder. Tinning yoursoldering iron in this manner
will aid in future soldering.
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Prep Step 4: Tinning the iron (close-up)
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Soldering
Iron
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Move soldering iron until tip is
touching wire & solder pad
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Move solder to touch edge of tip.
Solder
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Hold until solder melts
on tip by wire
Solder
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Move solder back to touch wire only
Solder
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Move solder in to form a
small pocket
Solder
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Move soldering iron tip up. Thiswill drag solder up with it.
Solder
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Look for
shinny fillets
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Soldering Tips
1. Make sure tip is hot
2. Clean & tin tip
3. Keep tip clean by using wet sponge and cloth
4. Heat until the parts are hot enough to melt solder
5. Hold until solder flashes around pad
6. Do not put too much solder on
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TIPS:
- Use caution when clipping leads
to avoid flinging metal acrossthe room.
- All soldering must achieve a
good solder filet on the pad as
shown for circuit reliability.
- Also clip the leads in this
fashion.
- Bend resistors and diodes usingyour plastic tool as shown.
Example of a good solder filet
workmanship.
nasa.gov
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Top View
Tinned Copper Traces
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Top View
Soldered
Solder bridge shorting two traces - bad, bad, bad
But, can be fixed by reheating or using solder sucker
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Board Safety:
Caution:
Many of the components used in this workshop are
sensitive to electrostatic discharge (ESD). Please ensure
that you are wearing your protective wrist strap at all
times. There will be a warning slide when components
are ESD and heat sensitive.
Clipping leads can sometimes cause them to separate in
a rapid manner that could cause injury. Please takecaution when clipping leads. Wear your safety glasses at
ALL TIMES!
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Board Safety:
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Reading a Resistor:
The resistors in this workshop
have already been organized byvalue.
In the event that your resistors
get mixed, please refer to the
chart at the left to classify your
resistors, or use your multimeter.
If you are unsure, dont hesitate
to raise your hand and ask for
assistance.
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Pre-Bending:
Pre-Bending 101:
- Pre-bending is a technique that allows
components to be easily inserted into a
PCB.
- Pre-bending also allows components to laymore flush with the board.
- Bending components to the correct bend
radius takes practice, but mastering the
technique will reap rewarding benefits!
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Pre-Bending:
Pre-Bending 101:
- Start with the bending and prodding tool in
the position shown in the top picture.
- Choose a location along the length of thetool that will yield the appropriate bend
radius.
- Use your thumb to bend the lead such that
the component and lead are orthogonal.
90
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Hands-on: Solder ing
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- Get into your teams
- Each person on the team will solder their own
circuit
- You and your team will have 50 minutes
- Let me know when you are done
Hands-on: Solder ing
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Prep Step 1: Tool Layout
- Prepare tools for the
construction process.
- Put on your safety
glasses.
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Prep Step 2: Grounding
- Put on a static strap to remain
grounded. Also make sure the strapis tight across your wrist.
- This will protect any parts from
electro-static discharge (ESD) and its
harmful effects.
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Prep Step 3: Soldering Station
- Turn on the soldering iron
- Set the temperature control on
the soldering iron to a
temperature less than 700 F
and greater than 450 F.
- As a general rule use a
temperature in the range
between 550 and 650 degrees
Fahrenheit.
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Prep Step 3: Soldering Station
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Prep Step 4: Tinning the iron
- Tin the tip of the soldering
iron by melting an inch or soof solder on the tip.
- The iron will now look shiny
on the tip.
- Then wipe any excess solder
on the golden sponge.
- Now place the iron back into
the holder. Tinning yoursoldering iron in this manner
will aid in future soldering.
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Prep Step 4: Tinning the iron (close-up)
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Step 1: Distribute solder kits among team
You will have to share the soldering stations
Help each other learn the techniques
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Step 2: Layout kit (Socket not shown)
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-
Voltmeter is
very useful
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Voltmeter 101:
-
This is the set up typical ly used
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Voltmeter 101:
-
Use this
setting to
checkresistor
values
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Voltmeter 101:
-
Use this
setting to
check DCvoltage
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Voltmeter 101:
-
Use this
setting to
checkcontinuity
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Step 3: Look at board, find reference point
Hands-on: Solder ing
18Install Side
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Step 3: Look at board, find reference point
Hands-on: Solder ing
19Solder Side
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Step 4: Flip board over and solder 8 pin socket
Hands-on: Solder ing
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Step 5: Install 555
timer. Small circle
placed over pin hole
1
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Step 6: Flip board over and bend chip leads outDO NOT SOLDER AT THIS TIME
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Step 7: Install 120 k resistor (Brown, Red, Yellow)
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Step 8: Install 33 k resistor (Orange, Orange, Orange)
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Step 9: Verify resistors
Hands-on: Solder ing
120 k
Brown, Red, Yellow
33 k
Orange, Orange, Orange24
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Step 10: Flip board over Step 11: Solder Resistors
Hands-on: Solder ing
120 k
Brown, Red, Yellow
33 k
Orange, Orange, Orange25
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Step 12: Inspect solder joints and trim leads
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Step 13: Flipboard over
and install
capacitor
Gray strip
indicates
negative
lead
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- Lead
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Step 14: Verify capacitor is installed correctly
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- Lead
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Step 15: Flip over board and solder capacitor
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- Lead
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Step 16: Verify solder joint and clip leads
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Step 17: Install RED LED over 120 k ResistorNegative side is facing edge of board
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Negative Lead
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Step 18: Install GREEN or YELLOW LED over 33k Resistor. Negative side is facing edge of chip
Hands-on: Solder ing
Negative Lead
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Step 19: Flip board over and solder LED leads
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Step 20: Solder chip to board. Go slow
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Step 21: Verify solder joints and check for solder
bridges
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Step 23: Flip board over and solder battery leads
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Step 24: Attach test battery and watch what you made
NOTE: If it doesnt work, detach battery immediately
and have it inspected
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When completed, please wait for further instruction
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Questions?
http://calspace.ucsd.edu/spacegrant/