Electronics Circuit Diagram

The following schematic shows the design of a 2 Cell Lithium Ion Charger Circuit Diagram using 555 Timer and LM339 IC. The circuit could be used to charge other types of batteries such as Ni-Cad, NiMh or lead acid. The LM339 IC consists of four independent precision voltage comparators with an offset voltage specification as low as 2 mV max for all four comparators.

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The following schematic shows the design of a Basic NiCad Battery Charger Circuit using Single Medium Power Transistor. The voltage across the pair of 1N4148 diodes biases the base of the BD140 medium power transistor. This suits most 1.5V and 9V rechargeable batteries.

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This Mobile Phone and iPod Batter Charger Circuit Diagram/PCB Layout Design can be used virtually anywhere. The actual charging circuit is incorporated within the iPOD or MP3 player itself, which only requires a 5V supply.

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The following schematic shows simple design of a USB Powered Single Cell Li-Ion Battery Charger Circuit Diagram. This design uses LM3622 as the controller.

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