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@ -9,10 +9,10 @@
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authors: "Gabe Venberg",
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)
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TRRS (Tip Ring Ring Sleeve, or, as you may know it, "headphone jack with microphone support") cables have long been the go to connector between split keyboard halves.
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TRRS (Tip Ring Ring Sleeve, or, as you may know it, "headphone jack with microphone support") cables have long been the go-to connector between split keyboard halves.
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They are cheap, compact, and thanks to their popularity, come in a variety of aesthetic styles.
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However, TRRS jacks were only designed for passive electrical components, and expose one large flaw when used actively.
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However, TRRS jacks were only designed for passive electrical components, and expose a serious flaw when used actively.
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When a TRRS cable is (dis)connected, the tip of the plug will slide past every single contact of the jack.
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Likewise, the first contact of the jack will slide past every contact of the plug.
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@ -51,7 +51,7 @@ Now, what if we put the 5v at the base, so that it is the first pin disconnected
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)
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In this case, we are looking at the active side of the board, connected to USB, and supplying power to the passive side.
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Now, when unplugged the 5v contact of the jack will immediately make contact with the Rx line,
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Now when unplugged, the 5v contact of the jack will immediately make contact with the Rx line,
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pulling it up to 5v and damaging the pin on the passive side of the board.
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No matter what order we put the contacts in,
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@ -60,13 +60,13 @@ No other electronics found in your home suffer permanent damage from simply bein
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In a moment of carelessness or forgetfulness, damage to hardware could easily happen.
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So what are the alternatives?
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USB-C, while almost as small as TRRS, are more expensive component wise and and
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USB-C, while almost as small as TRRS, are more expensive component wise and
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having the same connector for board-to-board and PC-to-board connections may lead to user error.
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There are also a wide variety of JST and Molex connectors, some of which rival TRRS in size,
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but premade cables are not readily available,
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and many connectors have a tendency to work themselves loose over time.
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My personal favorite are 4P4C connectors, also known as RJ9, RJ10, or RJ22.
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While bulky on the PCB, the connection is sturdy, cables are availible, and one can make ones own cables with a cheap crimping tool.
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While bulky on the PCB, the connection is sturdy, cables are availible, and one can make one's own cables with a cheap crimping tool.
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There are of course other connectors, and any with at least 4 conductors will work for a split keyboard.
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Unfortunately, there does not seem to be a perfect connector, but there are many alternatives better than TRRS.
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