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2. Copper foil - Wikipedia

   en.wikipedia.org/wiki/Copper_foil

   Copper foil is a thin sheet of copper metal that is widely used in various applications due to its excellent electrical conductivity, malleability, and corrosion resistance. It is an essential material in the electronics industry, especially for manufacturing printed circuit boards (PCBs) and other electronic components.

3. Perfboard - Wikipedia

   en.wikipedia.org/wiki/Perfboard

   Top of a copper clad Perfboard with solder pads for each hole. Perfboard is a material for prototyping electronic circuits.It is a thin, rigid sheet with holes pre-drilled at standard intervals across a grid, usually a square grid of 0.1 inches (2.54 mm) spacing.

4. Dutch metal - Wikipedia

   en.wikipedia.org/wiki/Dutch_metal

   The alloy typically consists of 85–88% copper and the remainder being zinc. It is also known by other names such as "composition gold leaf", "Dutch gold", "Schlagmetal" and "Schlag leaf". [1] It is very malleable and ductile and so can be beaten into very thin sheets. These sheets are sold for use as metal leaf or imitation gold leaf. [2]

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6. Planar transformer - Wikipedia

   en.wikipedia.org/wiki/Planar_transformer

   As the current conductors are thin sheets of copper, the operating frequency is not limited by skin effect. As such, high power converters built with planar transformers can be designed to operate at relatively high switching frequencies, often 100 kHz or above.

7. Solder alloys - Wikipedia

   en.wikipedia.org/wiki/Solder_alloys

   About 100 times slower erosion of copper than ordinary tin/lead alloys. Suitable for soldering thin copper platings and very thin copper wires. [56] Sn 60 Pb 39 Cu 1: Pb: No: Sn 60 Pb 38 Cu 2: 183: 190 [16] [17] Pb: Cu2. Copper content increases hardness of the alloy and inhibits dissolution of soldering iron tips and part leads in molten ...