The Vintage Li-Ion Charger

252

06:06:15

All old laptops have battery of Li-ion  cells, that can be useful for electronic projects. But these cells need to be checked. This charger circuit is assembled from vintage components. The  RS-trigger turns on the relay, the cell (20 mF capacitor) starts charging. The red LED indicates the charging mode. When the voltage on the cell reaches 4.1 volts, the trigger returns to original state; the green LED lights up. Before start the power switch has to be turned off.  Then start, turn on the power, press the start button.

published 8 years ago

solartech

8 years ago

What about trickle charging?

alexmayorov

8 years ago

To add trickle mode connect DC-voltage source to upper contact of relay. Set voltage to recomended maximim value for your cell. And don't forget current limiting resistor to protect DC-source. Delete green LED.

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