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12V battery backup circuit tutorial how to build and protect your devices

In this video I’m showing how I’ve built a very simple battery backup circuit for my home alarm system. The circuit charges a ...
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12V Battery Charger Circuit

This battery charger circuit can be used to charge one or more batteries with the total nominal voltage of 12 V, meaning ten NiCd battery or six 2 V lead acid. The circuit is pretty small and can be ...
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12V Battery Level Indicator Circuit

Red: Power Connected (0%) Yellow: Greater than 10.5V (25%) Green 1: Greater than 11.5V (50%) Green 2: Greater than 12.5V (75%) Green 3: Greater than 13.5V (100%) Of course, you may select your own ...