Transcript Building SkeeterSat

Building SkeeterSat
Inventory Components
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Identify components
Use the parts list and assembly manual
Tape to card (except for ESD sensitive items)
Label with Designator, Type and Value
e.g. C3, capacitor, 0.1uF
Locate component on schematic diagram
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Electronics - SkeeterSat
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Building SkeeterSat
Assemble components on PCB in accordance with
Instructions in the SkeeterSat manual
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Locate component position and orientation on PCB
Prepare leads and place on PCB (POLARITY!)
Solder
Inspect
When finished, do a final visual inspection and proceed to
testing. Follow instructions in the manual.
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Electronics - SkeeterSat
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Component Preparation
Axial Lead Components
Most will require their leads to be bent to conform to the
spacing of the hole in the circuit board.
Radial Lead Components
A well-designed board will have the holes spaced to match
radial lead parts. If adjustment must be made it must be done
very carefully.
Use a lead bending tool if possible.
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Electronics - SkeeterSat
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Component Placement
Observe the proper orientation of polarized components. Note
banded end of diodes, and notched end of IC chips and sockets.
Components should be as close to the board as possible without
stressing the leads.
Orient components so that their value markings can be easily
read after installation. Have resistor color bands all reading in
the same direction.
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Electronics - SkeeterSat
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Inspection
Inspect Twice, Solder Once
Be sure that the correctly valued component has been inserted
into the correct location, with the proper orientation, BEFORE
soldering any leads.
After soldering one lead it’s good practice to inspect again
before soldering the rest of the leads.
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Electronics - SkeeterSat
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Inspection
After all leads are soldered, inspect again, looking for:
“Dry” or “cold” solder joints
Poor adhesion of solder to pads or leads
Solder bridges across traces or pads
Unsoldered leads
90 % of all failures are related to soldering problems
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Electronics - SkeeterSat
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In Case of Emergency…
So, after all your best efforts and careful inspection,
you made a mistake…..
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Electronics - SkeeterSat
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In Case of Emergency…
So, after all your best efforts and careful inspection,
you made a mistake…..
Don’t Panic… Remain Calm…
Components can be removed from a circuit board.
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Electronics - SkeeterSat
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In Case of Emergency…
Use a “solder sucker” or “solder wick” to remove
solder from the hole.
It’s usually wiser to sacrifice the component by cutting
it’s leads off, then removing the leads one at a time.
This will avoid damaging the traces on the circuit
board, which are very difficult to repair
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Electronics - SkeeterSat
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Activity E4
Assemble and test your SkeeterSat.
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Electronics - SkeeterSat
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