i want design schematics digram for 12v dc regulated supply i know i need transfomer, diode, capactior and other component if input 230vac output 12vdc load 20ohms and o/p current 2amp how can i calcuate working voltage, current and rating of component
I think you need to buy the transformer (with 12VAC output), bridge rectifier, 12V regulator (7812 with can housing is good choice, it supports upto 5A current).