I use to work for a contract electronics manufacturer. They threw out a lot of a customers materials and I was able to get a hold of some of it. Among the items was a power supply board with 2 rectifiers and 4 voltage regulators. I have been working on a power supply board of my own patterned from this board. The customers board used 1 - 7805, 2 - 7812 and 1 - 7912 to obtain the respective voltages. I want to use 1 - 7805, 1 - 7905, 1 - 7812 and 1 - 7912 to get +5, -5 , +12 and -12 respectively. Their circuit and my circuit is attached. My problem is that I don't know how to GROUND the respective regulators to assure the proper voltage(s) output. Can I get help for this OR is this the wrong place?
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