On 16/12/11 17:21, Dave Tweed wrote:
> The first thing that crossed my mind was to have a "master disconnect" re=
lay;
> DPST in series with both battery leads. If its coil is low-power enough, =
it
> could be driven by the battery itself through a diode; otherwise, use an
> optoisolator to detect polarity on the battery side and use its output to
> drive the logic that turns on the relay(s).

That's... a really good idea. And I've got a bunch of optoisolators in=20
my junk box.

Thanks, Dave!

*goes looking for the lab notebook and a pencil...*

--=20
Phil.
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