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* Open power connector for [[mobile phone]]s, [[PDA]]s and laptops. ''(Wikipedia lists [http://en.wikipedia.org/wiki/DC_plug a variety of connectors] -- or were you looking for an AC [http://en.wikipedia.org/wiki/Power_connector power connector]? What sort of specification do you want?)'' | * Open power connector for [[mobile phone]]s, [[PDA]]s and laptops. ''(Wikipedia lists [http://en.wikipedia.org/wiki/DC_plug a variety of connectors] -- or were you looking for an AC [http://en.wikipedia.org/wiki/Power_connector power connector]? What sort of specification do you want?)'' | ||
* "Open Source Disability Gadgets: DIY for PWD" [http://panelpicker.sxsw.com/ideas/view/1745] "Gear and software for people with disabilities is usually provided through charity or from medical supply companies. It's hard or impossible to repair it, or get anyone to repair it. We need to hack the model for accessibility tools! With a culture of open source designs, Instructables, wikis, and blogs, we can start an international movement." | * "Open Source Disability Gadgets: DIY for PWD" [http://panelpicker.sxsw.com/ideas/view/1745] "Gear and software for people with disabilities is usually provided through charity or from medical supply companies. It's hard or impossible to repair it, or get anyone to repair it. We need to hack the model for accessibility tools! With a culture of open source designs, Instructables, wikis, and blogs, we can start an international movement." | ||
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== open design laptop == | == open design laptop == | ||
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* Open design laptop (you can replace the components). ''(see [http://communitywiki.org/odd/ComputerComponent/CustomNotebook computer component wiki: custom notebook])'' | * Open design laptop (you can replace the components). ''(see [http://communitywiki.org/odd/ComputerComponent/CustomNotebook computer component wiki: custom notebook])'' | ||
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* Many ham radio operators make all their equipment run on 12 V and a red/black Anderson Powerpole connector. [http://en.wikipedia.org/wiki/DC_connector#Anderson_Powerpole_connectors Wikipedia: DC connector#Anderson Powerpole connectors] | * Many ham radio operators make all their equipment run on 12 V and a red/black Anderson Powerpole connector. [http://en.wikipedia.org/wiki/DC_connector#Anderson_Powerpole_connectors Wikipedia: DC connector#Anderson Powerpole connectors] | ||
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* Dale Davis makes all his equipment run off 12 V, and uses a standard cable everywhere with identical barrel power plugs -- center positive, barrel ground -- at both ends. [[Barrel Power Jack]]. The outer barrel is ground so that if a one end of the cord is plugged into 12 V power supply and the other end touches a metal case (which is always grounded), it's harmless. A nice feature of barrel plugs is that you can plug them in at any angle, and it Just Works. | * Dale Davis makes all his equipment run off 12 V, and uses a standard cable everywhere with identical barrel power plugs -- center positive, barrel ground -- at both ends. [[Barrel Power Jack]]. The outer barrel is ground so that if a one end of the cord is plugged into 12 V power supply and the other end touches a metal case (which is always grounded), it's harmless. A nice feature of barrel plugs is that you can plug them in at any angle, and it Just Works. | ||
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* The [http://greenplug.us/ Green Plug] universal power adapter | * The [http://greenplug.us/ Green Plug] universal power adapter | ||
* [http://www.myaups.org/ The Alliance for Universal Power Supplies] | * [http://www.myaups.org/ The Alliance for Universal Power Supplies] | ||
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points out some non-obvious features that are nice to have in a power connector, | points out some non-obvious features that are nice to have in a power connector, | ||
and makes some recommendations on which to use and which to avoid. | and makes some recommendations on which to use and which to avoid. | ||
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Is it possible for the device to "negotiate" for exactly the voltage it needs, such that the same power adapter provides different voltages to different devices? | Is it possible for the device to "negotiate" for exactly the voltage it needs, such that the same power adapter provides different voltages to different devices? | ||
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* Perhaps the device could include a resistor+resistor voltage divider or resistor+zener voltage divider to produce a feedback voltage precisely 1.25 V lower than the voltage it desires, so a LM317 or equivalent regulator will produce exactly the desire voltage? | * Perhaps the device could include a resistor+resistor voltage divider or resistor+zener voltage divider to produce a feedback voltage precisely 1.25 V lower than the voltage it desires, so a LM317 or equivalent regulator will produce exactly the desire voltage? | ||
* ... in such a way that the power adapter automatically produces 0 V or "disconnected" soon after any device is unplugged. (hmm.. that would not be the case using the LM317...) | * ... in such a way that the power adapter automatically produces 0 V or "disconnected" soon after any device is unplugged. (hmm.. that would not be the case using the LM317...) | ||
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* ... ? | * ... ? | ||
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== micro controller based voip client == | == micro controller based voip client == |