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  • Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

need some help

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apa27572

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i have a project that has ac and dc power going into it. what i help with i want dc power to be priamry and ac be sec. so if dc drops out it flip to the ac side
 
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