There are an awful lot of Li-ion charging chips out there, and you would have thought there was one for every eventuality. But it turns out there isn’t. There is a sort of no-designer’s-land between 6 ...
The circuit in Figure 1 can help if you must transfer dc power and audio over a pair of copper wires. One application for such a circuit is a low-cost door-opening system with speech input. The ...
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