How to make 12 volts?

How to make 12 volts:

How to make 12 volts for the preamplifier. this voltage we need for making an amplifier. the positive negative and ground voltage needs for making an amplifier. class AB, class H amplifier needs dual voltage. when we need 12-0-12 voltage. normally we use 7812 and 7912. but 7812 and 7912 can not make strong amperes. it makes 1-ampere maximum. when we need 3/4 amperes then we have to make this circuit diagram.

How to make 12 volts

We can use 15-0-15 voltage to 50-0-50 voltage to make 12-0-12 voltage. when we make an amplifier we need 12-0-12. then we use 7812 and 7912 but we can not get strong amperes.  if we make this circuit then we can get strong amperes.

How to make 12 volts

this is the diagram

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