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I have built a project that will run off an attached 12v battery. If I wanted to add the ability to power it off the mains instead, I thought of just adding diodes on the positive, but I was wondering if there was anything else I should do? Do I need a switching power supply? does anyone have a schematic?

Thanks
Nigel
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Quote
I thought of just adding diodes on the positive,
Of the mains!!!

You need a mains 12V DC adapter, there are lots about for cheap.
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