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2. Printed circuit board - Wikipedia

   en.wikipedia.org/wiki/Printed_circuit_board

   A printed circuit board (PCB), also called printed wiring board (PWB), is a laminated sandwich structure of conductive and insulating layers, each with a pattern of traces, planes and other features (similar to wires on a flat surface) etched from one or more sheet layers of copper laminated onto or between sheet layers of a non-conductive ...

3. Reference designator - Wikipedia

   en.wikipedia.org/wiki/Reference_designator

   1A1A44J5 - Unit 1, Assembly 1, Sub-Assembly 44, Jack 5 (J5 is a connector on a box referenced as A44) 1A1A45J333 - Unit 1, Assembly 1, Sub-Assembly 45, Jack 333 (J333 is a connector on a box referenced as A45) A cable connecting these two might be: 1A1W35 - In the assembly A1 is a cable called W35. Connectors on this cable would be designated:

4. Through-hole technology - Wikipedia

   en.wikipedia.org/wiki/Through-hole_technology

   Through-hole (leaded) resistors. In electronics, through-hole technology (also spelled "thru-hole") is a manufacturing scheme in which leads on the components are inserted through holes drilled in printed circuit boards (PCB) and soldered to pads on the opposite side, either by manual assembly (hand placement) or by the use of automated insertion mount machines.

5. Surface-mount technology - Wikipedia

   en.wikipedia.org/wiki/Surface-mount_technology

   Assembly line with pick-and-place machines PCB assembly line: pick-and-place machine followed by an SMT soldering oven. Where components are to be placed, the printed circuit board normally has flat, usually tin-lead, silver, or gold plated copper pads without holes, called solder pads.

6. LED circuit - Wikipedia

   en.wikipedia.org/wiki/LED_circuit

   In coin cell powered keyring-type LED lights, the resistance of the cell itself is usually the only current limiting device. LEDs with built-in series resistors are available. These may save printed circuit board space, and are especially useful when building prototypes or populating a PCB in a way other than its designers intended. However ...

7. Chip on board - Wikipedia

   en.wikipedia.org/wiki/Chip_on_board

   The PCB of a quartz watch. The clock IC is under the drop of black epoxy. Chip on board (COB) is a method of circuit board manufacturing in which integrated circuits (e.g. microprocessors) are attached (wired, bonded directly) to a printed circuit board, and covered by a blob of epoxy. [1]