Circuit Schematic Ni-MH Ni-Cd Adjustable Constant Current Charger using LM317

BatteryCharger. - Here is Circuit Schematic Ni-MH Ni-Cd Adjustable Constant Current Charger using LM317 that also completed with project. This circuit can be adjusted to any value from a few milliamp to about 500mA. The max current is 500mA because it is the limit of the BC140 transistor in the current-limiting part of the circuit.

The input voltage has to be 5.25v above the required output voltage, because of 1.25v across the current-limiting section and Approximately 4v is dropped across the regulator.  The LM317 3-terminal regulator will need to be heatsinked.

Component List

  • R1 100Ω
  • VR1 500Ω Preset
  • C1 0.1µF
  • C2 0.01µF
  • D1 1N4001
  • Q1 BC140
  • IC1 LM317

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