"Gerry Caron" wrote in message
.. .

"RST Engineering" wrote in message
...
What do you want the cutoff voltage to be? Personally, I'd pick 13.0
volts, but it is child's play to do any voltage you want.

That's about right, but here's a couple lessons learned the hard way:

I'd like to see some hysteresis in the switching -- say power on at 13.1V
and off at 12.9V.

I never do a comparator without hysterisis.



It would also be a good idea to have some limitation on inrush current or
at least a delayed response. I've seen too many cases where it goes into
oscillations when a device with a hefty inrush pulls the detector voltage
below the switch point which shuts down the power at which point the
voltage recovers and it turns back on and the cycle starts over.

I was sort of figuring on about a ten second loop constant.

Thanks. How you been, Gerry? Long time no type. Who you working for now?

Jim



Gerry