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Sometimes you have an item of electronics, like a radio or a handheld computer game which takes batteries and has nowhere to plug in a power supply. This idea is for a power supply for these devices.
Say this is a device which takes 4 AA batteries. You would insert the batteries marked "+" and
"-" with a couple of dummy batteries between them. Thin ribbon cables would lead from the "+" and "-" batteries back to the power supply. You select "6v" on the power supply and your device is now mains-powered.
BE-AA, 1-6 AA Cell Battery Eliminator for 12-24 Volt Systems
The QCAvionix 1 to 6 AA cell battery eliminator will power any device that requires up to six regular or alkaline batteries from an aircraft, boat or automobile 12-14 volt or 24-28 volt system. [Ian Tindale, Jan 07 2005]
||Those little black AC power blocks put out a high amount of ELF radiation as they are not shielded usually.
hippo: yes. [+]
||You just can't trust elves.