[sdiy] zener question/passwords

[Brockr0 at cs.com]

In a message dated 2/6/01 Ken MacBeth writes:

> Thanks everyone for your help so far with the zener
>  question.
>  I'm employing an NE570 (-+24V) in my circuits and am
>  still awaiting it's arrival! I've got an NE571 (-+18)
>  that I want to try NOW! I drive my stuff from -+12V,
>  but this will blow the 571 Compander, so I'm looking
>  for a temporary 'quick fix'. I've built a pair of
>  voltage followers (correct term/not sure?) which give
>  me anything -+ under 12V split rail, but there is no
>  room for the final circuitry. I'm also having doubts
>  about using this chip or its sibling due to
>  availability/potential obsolesance.

The NE570/1 is designed for unipolar operation so why 
not run the part from +12V ?

Brock