> Hi Kenneth, > My idea of how it works is the chip on the servo just translates the > impulse time into travel and direction, Yes, an error pulse(difference between local and input pulse) is generated. > then it waits for the feedback to equal the travel The old Signetics chip(NE544) just sent out a streched error pulse that should move it to the correct postion. Ther was no checking if it got there until the next pulse. Not sure about modern servo ICs(MITSUBISHI M51660). > and when it gets there it breaks the servo. Don't think so except maybe for digital servos. > Then it waits for next pulse and repeats sequence, if no pulse supplied > servo goes into idle... Do you think the servo is simpler? Am I > looking to much into it? Mike DeMetz N9GEZ n9gez@qsl.net -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist