Just received a Starr-Tec MW100 walk around throttle system as a gift. Only problem is the unit has a final output of 30 vdc, more for G scale. I'm using HO scale. Issue, how can I reduce the final output voltage of 30 vdc to 14 vdc max for use on HO scale. Want to use the system so as not to offend the gift giver, who also controls the railroad operating budget (you know who I'm referring too). Help please.