This power supply will stabilize the voltage, both the positive voltage and negative voltage. IC 7815 will stabilize positive voltage +15V and IC 7915 will stabilize the negative voltage -15V.
If you need stabilized 15 V output, you should choose transformer output around 18-24V AC and use IC 7815 and 7915. If you need stabilized 6V output, you sould choose transformer output arround 9V-15V and use IC 7806/7906.
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