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Here is a Inductive charger designed for the Nintendo DSi. Cheap Chinese build, but it does work!
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Top has been removed from the unit here. Most prominent in the centre is a solid steel bar, simply there to give the device some weight.
Pair of Tri-colour LEDs at the front indicates charging status.
Induction coil is on the left, with the controller & oscillator PCB at the top.
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Closeup of the PCB, ICs have had their markings ground off.
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Induction coil. This couples power into a coil built into a special battery, supplied with the base, to charge it when the DSi is placed on the dock.
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Information Label on the base.
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Standard DSi charger port, connects to the charger you get with the DSi. Power switch is on the right.