3V-30V/3A Adjustable Regulated Power Supply
This is an adjustable and regulated power supply with 3V to 30V output voltage and supply up to 3A direct current. This circuit featured with short circuit protection and overload protection.
Download the manual of this circuit include the schematic and part list HERE

i want a circuit which charge the 12v and 7amp battery and 12v dc to ac 220 circuit
show the exact fig of ferro-resonant power supply
i want ask how to get 3vac to 12vdc?