Hi, I changed the gear ratio from 58:1 to 203:1. Based on some old posts. Works great now. Thanks, Kevin Hi, I posted this under EE, but then found a big discussion from 12/2000 about the tamiya twin motor drives. I still have the same question, the FA-130 motors are rated 3v@800ma stalled. So why can't I drive the twin motor gear box a pic and a sn754410 chip with 4AA batteries ? One note I did have it set to 58:1 ratio, I am going to try 203:1 next. Thanks in advance, Kevin -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads