I wasn't quite getting the voltage I wanted. I tried the 4 10 ohm 1 watt resistors in series and got pretty good results. The next thing I tried is putting two sets of 10 ohm 1 watt resistors in parallel, and then put the two parallel resistor sets in series. What type of load does this put on the system compared to the 4 10 ohm 1 watt resistors in series? I don't know the formulas for series and parallel circuits.

Greg