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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.

mixing voltages

  1. E

    Mixing Voltages

    If I had a fire alarm system, or any thing for that matter, and I wanted to add battery back-up... System normally powered by a 12V DC transformer, but if I added a 9V battery, would this cause problems?

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