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.

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.

this is the diagram

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Build a Transformer or construct the transformer. Home Theater Circuit Diagram 5.1

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