>   Old fashion: a npn transistor or an open collector gate with 15V Vce (
> unfortunately the open drain ra4 style is out of voltage spec ) which
> control a power NPN ( darlinghton if necessary ). A resistor across the
BC
> of power transistor keep the transistor on, the open colector
controlling the
> base of the same transistor shut down the whole kk when is on.
> Everything can be replaced with a 4 terminal controlled 12V stab with
> reference adjustment floated with 1V upper the ground using a
> simple resistor.

I don't like this because it results in higher voltage drop when on and
will require some current just to keep off.


*****************************************************************
Embed Inc, embedded system specialists in Littleton Massachusetts
(978) 742-9014, http://www.embedinc.com

--
http://www.piclist.com hint: The list server can filter out subtopics
(like ads or off topics) for you. See http://www.piclist.com/#topics