The following automatic battery-charger design is created with a circuit that could qualify as the simplest window comparator ever built around a single transistor (see the figure). It starts charging ...

The circuit has been designed to construct a practical mechanism that can easily and automatically charge batteries rated at 6 V or 12 V used in automobiles. BC557 – PNP general purpose transistors ...

Battery-powered, mobile systems rely on their batteries and battery chargers for reliable operation. Unfortunately, use of the actual battery makes it difficult for design engineers to perform a ...