Mechanical Keyboards: Unterschied zwischen den Versionen

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 Off-the-shelf PCBs have the USB controller onboard, so nothing further is required for these. Many self-made ones use a Teensy or something similar as a USB controller, because there's open source software available for them. Note that the Teensy is available [https://hacker.parts at the hacker.parts machine] at metalab.
+=== Keyswitches ===
+This is the hardest part of a keyboard. Fortunately, off-the-shelf parts are available at affordable prices (EUR 60-120 for a full keyboard). Every type of keyswitch has its unique response pattern to physical manipulation. The exact resistance at every point in the push is documented in the manufacturer's datasheet.
+Many enthusiast keyboards also don't come with mounted keyswitches, so the buyer can solder their own favorite switch. Most keyswitches use the same PCB pattern, so they're interchangeable. This happened because many manufacturers copied Cherry's design.
+The keyswitch type can usually identified by the color of the stem (this has only marketing reason, not technical). Cherry has defined some colors some others like Gateron copy. Sometimes the colors of different manufacturers also have different meanings. Common types are explained in [http://www.keyboardco.com/blog/index.php/2012/12/an-introduction-to-cherry-mx-mechanical-switches/ this article].