Symmetrical power sources circuit diagram

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This very simple circuit diagram, allows to make a symmetric power source using a few electronic components.
Usually to achieve a symmetrical power sources requires the use of two voltage rectifiers that debits equal output voltage, but opposite polarity measured to reference point.
Usually, the rectifier has a transformer with two secondary windings.
This scheme allows the use of an transformer with a single secondary winding, which will provide the two voltages.

Circuit Diagram: 
Symmetrical power sources circuit diagram

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