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Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
Well, if it's really connected like that, you will get +5V from the 7805 and, since the 7905 is referenced to +5V, its output wiil be approximately zero volts. It's like GND, but it will only sink current. I can't imagine why this would be done. Are you sure it is connected like that?
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