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instead os the dpdt switch , try a switched power jack, so it will switch to ac power when you plug it and will switch back to battery when you unplug it, its like thishttp://www.ebay.com/itm/5-x-DC-Power-Jack-2-1mm-Enclosed-Frame-With-Switch-External-USA-Seller-Free-Ship-/221774839509?hash=item33a2cf7ed5:g:u3gAAOSwpDdVWBxK
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