i need to produce about .6volt from a 12 to 24volt power source to control adjust pin on driver. i get what i want with a 20k and 1k when voltage is 12volts. i want to use a zener to reduce 24volts down to 12. if a zener will work how do i connect, between the voltage divider resistors and ground or does it have to be in front of both voltage divider resistors? if it must go in front of both, when i add another resistor to limit current to zener, will current be too low through divider?