Circuit design help needed - analog

Discussion in 'The Projects Forum' started by johnerbes, Oct 17, 2008.

  1. johnerbes

    Thread Starter New Member

    Oct 17, 2008
    Typical fuel tank sending units have a resistance of 0 to 10 ohms in the full position and 90 to 240 ohms in the empty position. I have an old Weston 50uA meter I would like to use as a fuel gauge. I need help with designing an analog circuit that will drive the 50uA Weston meter from the tank sending unit (and not blow up the gas tank). V+ will be from the car's 13.5 V battery (running). Thanks for the help.