How can we make -ve Power Supply

Hello Friends This is Nitin Dhaneshwar,Asking all of you how can we make -ve power supply In this power supply the load is 5 & 12 volt .Can we make both -ve &

+ve power supply. I wanna make +5,-5,+12,-12 power supply in single goard Is it possible?
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If the load is light:

Start by making a +15 and -15V supplies.

Use LM7812 and LM7912

Use LM7805 and LM7905

--   forging knowledge
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Ken Smith

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