Hi,

Just an interesting question ...

which is applied to the pic first ???

The Pic 5V

OR

The LiPo DIRECT 4.3v ???

could easily explain the correct operation with a series resistor ...

coz The clamp diodes surely would not like to power the whole card ...

just to see ... try to place a 1N400x from A0 input to the +5 v ...

my two cents ...


Alain