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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...) | ||
− | * What do we need to | + | * What do we need to ahead of time to design things so they don't overheat, posing a safety risk? (Rather than, say, finding out problems after they are in the field, and issuing a recall).<ref> |
[http://www.bbc.com/news/technology-28956813 "HP recalls more than six million power cords"] | [http://www.bbc.com/news/technology-28956813 "HP recalls more than six million power cords"] | ||
</ref> | </ref> |