Model airplanes and Helicopters come with battery chargers that usually need to be charged off a 12 vdc power supply. They are rather expensive, so the manufacturers do not include them with your models. So if you want to charge your heli and plane batteries in the house instead of in your car, try making your own supply, as I demonstrate here. Thanks to one of my Subscribers, Bryan, (bjudoka1) for putting the idea in my head. I was thinking that you could also run a wire right out of your home pc and use it at the same time.

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