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RE: LM7805 voltage drop when attach load

Posted by fredtr on June 26, 2017 at 04:49:48:
It would help if you provide the schematic. If there are any resistors in series to the source or load of the 7805, measure the voltage across them, which will tell you how much current is being drawn. The problem is you are drawing more current that you are sourcing, possibly a problem in your pcb layout or an incorrect component.