I'm looking for a single device (meaning...I can do it with a couple of opa= mps,etc) that will accept a single ended 5V digital input, and give me diff= erential output....+5/-5 out.=A0 Rail to rail would be nice, but if I need = to run it above 5V (say 9-12V) for the supply I can do that.=A0 Highest fre= quency would be about 5KHz that I would run thru it. Ideas? --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .