HI JOhn...I've heard of voltage doubler circuits....not much help but might be a clue... ..72/73 - Bruce (VE5RC+VE5QRP) QRP-C#1 QRP-L#886 ARCI#9683 Zombie#272 A-1 Operator Club - 10/10# 944 - QRP Borg#1 - Whiner#10 - - VE5QRP SOC#11 - VE5RC SOC#12 - oo#148 - K2#2032 - COG#15 - - Zone Alarm + AVG Virus Protection - "QRP! How sweet it is!" "I am da man wit "DAH" paddle!"