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Modern Computer keyboards contains mostly plastics but there are a bit of precious metals in them. One part is in the small circuit board holding the components but usually that's not a rich source of gold, a few bond wires in the chip or under a black plastic blob. The main precious part is silver in the mylars that makes up the actual key switches in the keyboard.
There are a lot of different keyboard constructions out there, but since 1990 the majority is with mylars.
- Keyboard cable, copper. Sometimes with gold plated connectors.
- Controller, circuit board.
- Mylars, screen printed silver on a plastic sheet.
- Steel plate, scrap iron. Gives
- Case and keys, plastic.
Older keyboards contains various switch solutions so instead of mylar sheet there could be
- Reed switches operated with magnets in each key
- Capacitive sensing, an aluminum foil that forms a capacitive connection.
- Individual switches with gold plated contact surfaces