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Raspberry Project

Rocket Nut
I am working on a stepper motor project. I am wondering if the 5V PWR GPIO pins can be used to power the raspberry? What I want to do is to use a 12VDC 5Amp well plug and then use an LM7805 regulator to power the raspberry through the 5V PWR GPIO pins. I need 12VDC to run the stepper motor. Is this possible?