On Thu, Sep 20, 2012 at 8:58 AM, Anthony Toft wrote: > While I am sure you have looked at the devices in question, I figure I > will mention it for completeness... > > Do any of the systems (mic receiver, audio amp etc) have a spare > output? maybe a headphone or monitor jack or even output for a cassette > tape deck? If so, what is preventing you from interfacing directly with > that? > Some do, but some don't. I have to aim for maximum compatibility and seamless integration. If the professor is used to plugging his line out into the speaker system, I should be able to stack on a splitter on the audio jack, and he shouldn't be able to tell the difference when he plugs his output into the jack again the next day (minus the obvious presence of a splitter adapter in the audio jack, of course). My device should cause zero disruption and zero interference. For those reasons, I think a passive, simple splitter, branching off into an audio transformer isolator and then into my device is the best way to go. Note that the mobile microphones *are* always attached to the lecturers' bodies (near the head) and they always *do* adjust the volume if needed so that everyone can hear them clearly. This means I can guarantee that the signal coming out of the splitter, into my device, is clean, relatively noise-free, and at the perfect recording level. --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .