The unit is novel as it’s display graph shows you the time the battery has been charging in 2 minute intervals up to 16 minutes when finished. The “power” led indicates source voltage as it dims, and goes out at 11 vdc, this is needed because the unit draws 20 amps fully charging 4 batteries [...]
The above circuit will charge any 2-cell * Li-Ion battery pack. Maximum current is about 650 milliamps. The circuit is designed for batteries of 900mah or higher. Note this circuit is NOT for Li-Metal batts (i.e. Duralites). Power source can be a 12v Gell cell (Power panel), or can be powered by a car’s cigarette [...]
To use portable devices such as digital camera, wireless headphone, pocket radio, etc, which they operates with two “AAA” size batteries, using rechargeable Ni-Cd batteries is a conscionable way to reduce cost. Above circuit has been designed to charge automatically two series 350mAh “AAA” size batteries. Set the 20KOhms multi turn potentiometer to get a [...]
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