This link was in an old thread: http://forum.allaboutcircuits.com/attachment.php?attachmentid=1106&d=1185625596
I think it is a starting point for what I want to do, which is to switch on a relay when the voltage hits a point between 12 and 15 volts (adjustable), and to switch off the relay when the voltage falls below 11 to 14 volts (again, adjustable, independently). I'd also like to do a circuit that would be the inverse of this, would turn on the relay when the voltage drops below the 11 to 14 volts, and off when above the 12 to 15 volt range -- but, in both cases, I'd like to be able to adjust these voltage settings independently of each other. Can anyone help?
Thanks!
I think it is a starting point for what I want to do, which is to switch on a relay when the voltage hits a point between 12 and 15 volts (adjustable), and to switch off the relay when the voltage falls below 11 to 14 volts (again, adjustable, independently). I'd also like to do a circuit that would be the inverse of this, would turn on the relay when the voltage drops below the 11 to 14 volts, and off when above the 12 to 15 volt range -- but, in both cases, I'd like to be able to adjust these voltage settings independently of each other. Can anyone help?
Thanks!