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Step 4Soldering the components
The various components, as detailed in the data sheet for the ic (available from the web site of Microchip Technology) was then soldered in position. The two LEDs are new. All the other components have been rescued from old hard disks.
The red led is supposed to light up to inform us about error conditions. The other green LED (the clear one in the picture) lights up to indicate that charging is taking place. At the end of charging, it will blink or go out, depending upon the last digit of the ic part number.
The board is complete, all that remains is for it to be connected to the battery and the charging source.
If the source voltage is much above 5V a heat sink might have to be soldered to the thermal pad of the chip for charging to take place without interruptions due to the chip overheating.
It has integral thermal overload protection. If needed, a thermistor in contact with the battery may be used to protect the battery as well. The battery overheat protection feature has not been included in my version of the circuit.
The red led is supposed to light up to inform us about error conditions. The other green LED (the clear one in the picture) lights up to indicate that charging is taking place. At the end of charging, it will blink or go out, depending upon the last digit of the ic part number.
The board is complete, all that remains is for it to be connected to the battery and the charging source.
If the source voltage is much above 5V a heat sink might have to be soldered to the thermal pad of the chip for charging to take place without interruptions due to the chip overheating.
It has integral thermal overload protection. If needed, a thermistor in contact with the battery may be used to protect the battery as well. The battery overheat protection feature has not been included in my version of the circuit.
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