Dear readers, I want to design a slip ring system with concentric circles to transmit 7 signals(ie 8 connectors). Do thou know a source(I prefer books) which shows several methods of transmitting signals on rotating elements ?! Diameter of the outermost circle: 117 mm. Diameter of the innermost circle: 81 mm. Max voltage: 12V Max current: 1A The system is not very sensitive so there can be fluctuations(+- 0.2A, +- 1V). Regards Thilo Klein -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist