I would like to build a simple battery powered cable tester that will sense and indicate the presence of 4 to 24 VDC on a four conductor cable, with one of the conductors being common. I would like to use three LEDs that will indicate the respective conductors that have a voltage present. I was looking at using something like a ULN2003 or MC1413, but these have inverted outputs and would indicate when the voltage is absent, not present. I would like to use parts that are easy to locate (Mouser Electronics is my primary supplier) so something like a UDN2981 is out of the question. Because this is a tester that will be frequently connected and disconnected from various live cables, I need something that is robust and will be resistant to static discharge, etc.