This Circuit have output voltage 14 volt with current maximum 4A . Can be use on nicad battery and accu , wet and dry . But the accu must be 12 Volt and have current 4A or higher. The current fillter voltage build of IC CA3140 or LM324 . You can which two IC. From the AC voltage will be lowered by trafo and rectified by diode .You can use diode up to 4A, this voltage to be supply for circuit.
See this 14 Volt Battery charger schematic circuit below :
|Click to view Enlarge|