nnp and ppn!! ever heard of that?
they perform not.
..................!signal copy........................
.....................negative...........................
....................................................
..........................|.........................
signal..negative..___|___..positive....battery..........
............................................
............................................
..................!signal copy........................
.....................positive..........................
....................................................
..........................|.........................
signal..positive...___|___..negative....battery..........
............................................
............................................
if you team them up, you can make
an amplifier out of batteries.