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Kevin asked How to supply dc power to 3 different circuits?
Ok, I need to connect 3 circuit together using a single 20v dc power supply. Ckt 1 needs 12v dc, 2nd needs 15v dc and 3rd needs 5v dc. I'm thinking of using 3 voltage regulator ic's LM7812, LM7815 and LM7805, but how can I get different grounds? Will this work? Please help
And got the following answer:
Won't work unless the grounds are common, ie, connected together. Is there a reason why you can't connect the grounds together? What are the 3 circuits and how do they interact? Otherwise, you need 3 separate power supplies, isolated from each other. Also, what is the current for each, that will determine the current in the 20v supply, and the sizes of the heat sinks.