The end result is to get a solid 5 volts on the output leg of the volt limiter. I was just curious as to why the resistor is part of this mod. The 5VDC regulator maintains a steady 5V at the output leg with 12 going into the input leg and the center leg grounded to the can. Whatever the purpose of the resistor being added to output leg of reg. and to ground I have yet to figure out.