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
The Original Article : "Ni-MH Ni-Cd Adjustable Constant Current Charger"
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