• 6.3V with 5V between the GND and Vin pins on the MDBT42Q

    I'm not sure I understand - so you're saying that the wires on your breadboard power supply that should supply 5v are actually supplying 6.3v?

  • yes, and up to 6.7V when the MDBT52Q is disconnected, even though I'm supplying less power than the supply is rated for.

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