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    I am losing 0.5 volts

    Hello, I need help as on the attached pdf drawing or eagle schematic, i am getting 4.5 volts at ESP and RFID reader. How it works: At the input it is 12 VDC, going through 5v dc regulator. The 5 vdc goes to Lipo charger and also to T1. T1 it is a switch between 12vdc in and battery. Then, power...