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Introduction I like building battery-powered circuits, but always in the back of my mind is the thought that I really ought to provide a ‘low-battery’ indication! Since it isn’t usually a core feature of the project, it often gets forgotten. This ultra-short blog post describes my attempt at a generic low-battery indicator that could (hopefully) be reused for many projects.   What does it do? This circuit alerts the user when the battery needs changing or charging. I have ...

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