dear, i have recieved ur question. ans : actually cetre tapped transformers has its own advantages , u can use normal transformer but its depend on application.when there is a requirement for greater amperage at a given voltage,we use discussed transformers, now in ur mentioned supply u can see that there is a variable voltage, also it has limit of 2 A current at given voltage, so schemated transformer provide u desired amperes and voltage , if u use normal then may be it will disturb ur current limitations.
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