[sdiy] SSM2164 protection

[David G. Dixon]

> Over the last few days Oscar and myself have been pushing 
> this investigation further.
> With a sprinkle of inspiration backed up by excellent 
> experimentation we have come up with a very simple solution: 
> one Schottky diode.
> 
> http://www.milton.arachsys.com/nj71/index.php?menu=2&submenu=2
> &subsubmenu=3

I love you, Neil Johnson and Oscar Salas!

In my layouts, since the 2164 V- pin is on the "wrong" side of the chip (the
same side as the V+ pin), I have to connect it to the rail with a jumper.
Replace that jumper with a Schottky diode, and I'm done!

Thanks 10^6 for taking this to such a satisfying conclusion.