12V 3A Battery charger schematic

Use of RS allows low charging rates with fully charged battery.
**1000 μF is recommended to filter out any input transients.

Simple12V 3A battery charger schematic, The LM350 series of adjustable 3-terminal positive voltage regulators is capable of supplying in excess of 3A over a 1.2V to 33V output range.

Source: National Semiconductor