Hi, Fred! This is my version of the mobile reference with triple LM399 averaging and statistical 7-10 V step-up divider: Schematic diagram http://www.mediafire.com/?srlfhhydq22r347 PCB http://www.mediafire.com/?667506m6usf6649 Testing http://www.mediafire.com/?dag35byj16ms389 Regards, Mickle T.