Hi all. I am looking for a schematic for a voltage switch. I need it to monitor a 12 volt bank of bats. I need it to have an output of 12 vdc. I need it to have ajustments for the high set point (13 volts dc) and a low set point of (10.0 volts dc) I need the output to be able to energize a small ice cube relay when the high set point is made and de-energize or turn off at the low set point. any ideas.