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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The following page contains detail information regarding how to design a Simple Battery Charger Circuit Board (PCB). The battery charger automatically starts the charging procedure when voltage drops below 12.6V, and finishes when it gets to 13.8V.

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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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This Lead Acid or Ni-Cd Battery Charger Circuit Diagram utilizes solar energy to charge a 6 volt 4.5 Ah rechargeable battery for various applications. The LM317 is capable of supplying in excess of 1.5A over a 1.2V to 37V output range. The LM317 regulators have internal thermal shutdown to protect the device from over-heating.

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