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 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 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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The following schematic presented here, shows a low-cost alternative Mobile Phone Battery Charger Circuit Diagram with a rating of 7.2 volts (usually apply for Nokia 6110/6150).

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The following schematic shows the 12V Battery Charger Circuit Diagram using LM317. The Rs sets output impedance of charger: Zout = Rs (1 + Rs/R1)

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