PRACTICAL ELECTRONICS

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PRACTICAL ELECTRONICS

• MASTERCLASS
• (Mr Bell)

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Basic Electronic Components

• These components will be
• discussed further during the course, also
  have a look at the posters in the room.

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Different types of electronic boards-

• Prototype breadboards
• Breadboards are used to test circuits. Wires
  and components are simply pushed into the holes
  to form a completed circuit and power can be
  applied. One of the main advantages of using a
  breadboard is that the components are not
  soldered and if they are positioned incorrectly
  they can be moved easily to a new position on the
  board.

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• Printed Circuit Boards (PCB)
• A printed circuit board, or PCB, is used to
  mechanically support and electrically
  connect electronic components using conductive
  pathways, tracks or signal traces etched
  from copper sheets 
• laminated onto a non - conductive
• substrate.

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• Strip boards (often called Veroboard)
• Strip board is a widely used type of
  electronics prototyping board characterized by a
  2.5mm regular grid of holes, with wide parallel
  strips of copper cladding running in one
  direction all the way across one side of the
  board. Electricity passes through the copper
  strips and components and wires are used to cross
  over and create circuits.

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Introduction to soldering equipment

• Soldering iron
• Iron holder
• Transformer power supply
• Sponge
• Tinning (cleaning tip)
• Fume extractor
• Safety spectacles
• Third hand

ALL NUMBERED FOR EACH PUPIL
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Additional working equipment

• De-soldering tool
• Lead free solder and dispenser
• Long nose pliers
• Wire strippers
• Screwdriver
• Magnifying glass
• Micro drill reamer

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First Aid In case of burns

• Immediately cool the affected area with cool
  running water or an ice pack (kept in staff
  fridge freezer).
• Remove any rings etc. before any swelling starts.
• Apply burn treatment gel from burns box (next to
  computer).
• Cover with a plaster to prevent infection.

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Introduction to practical soldering

• Soldering is a process in which two or more metal
  items are joined together by melting and then
  flowing a filler metal into the joint. The filler
  metal having a melting point of 230C.
• Soldering is used to form a permanent connection
  between electronic components.
• The metal to be soldered is heated with a
  soldering iron (350C - 370C) and then solder is
  melted into the connection.

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Preparing the soldering iron  Place the soldering iron in its stand and plug in. The iron will take a few minutes to reach its operating temperature of about 400C.    Dampen the sponge in the stand. The best way to do this is to lift it out the stand and hold it under a cold tap for a moment, then squeeze to remove excess water. It should be damp, not dripping wet.    Wait a few minutes for the soldering iron to warm up. You can check if it is ready by trying to melt a little solder on the tip.  Move the extractor next to the work piece being soldered to remove any fumes.  Wipe the tip of the iron on the damp sponge. This will clean the tip.    Melt a little solder on the tip of the iron. This is called 'tinning' and it will help the heat to flow from the iron's tip to the joint.
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• When the solder is in its liquid form run it
  up the wire to get the volcano shape

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