Neil narwani.org> writes: >=20 > I want to amplify some TTL-level signals for better noise immunity=20 > through about 10'-15' of wire through a vehicle, and trying to figure=20 > out what good options there are. I'd suggest looking at LIN Bus/ISO9141 drivers. These are designed for low speed networking in an automotive environment and can provide bi-directiona= l (half-duplex) comms over a single wire. The drivers are cheap, robust and easily available. I attempted to post this a few days ago, but from the wrong email address s= o please forgive the lateness. Cheers Mike --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .