I need to sweep 10KHz to 30KHz audio, and drive it such that a microphone element can pick it up at close range. I have an AudioPrecision that can do the sweep, but need a amp/transducer setup. This is for lab tests, so Im not really looking at building something, but just need to buy something off the shelf. Recommendations anyone? --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .