Saturday, April 6, 2013  Build an Automatic 6 volt 12 volt 24
volt Lead Acid Battery Charger Circuit  A simple yet accurate
automatic, regulated 6/12/24 volt lead acid battery charger
circuit is explained in this article. The circuit switches off
the current to the battery as soon as the battery reaches full
charge. An illuminated LED at the output indiacates the fully
charged condition of the battery.  The circuit diagram may be
understood from the following points:  Fundamentally the voltage
control  and regulation is done by the versatile, work horse IC
LM 338. An input DC supply volt in the range of 30 is applied to
the input of the IC. The voltage may be derived from a
transformer, bridge and capacitor network.  The value of R2 is
set to get the required output voltage, depeNding upon the
battery voltage to be charged. If a 6 volt battery needs to
charged, R2 is selected to produce a voltage of around 7 volts
at the output, for a 12 volt battery it becomes 14 volts and for
a 24 volt battery, the setting