At 10:51 PM 2/16/2013, Josh Koffman wrote: >One thing I'm finding a bit confusing as I research all of this is >trying to figure out exactly which chips I'll need to expand whatever >DSP I choose. For my application, I think at minimum I need 6 in/2 out >for the inputs to my headphones, and 1 in/3 out for the mic section. >The second could be done with discrete opamps rather easily though. It >looks like I'll need to add an external ADC for some (or all) of those >channels. No big deal, but I guess I will need to decide if I need an >ADC or an ADC/Codec based on the ultimate choice of DSP, correct? Hi there, Josh. I'm wondering why you don't keep this project entirely in the analog=20 domain? You can use little trimpots for pan L-R and regular=20 Asian-made audio-taper pots for the level controls. This would be a=20 fairly small package, cheap to build, and eminently easy to operate. I'm suggesting Asian-made pots for the level adjustments because they=20 are small and inexpensive (and reasonably reliable), I'm suggesting=20 trimpots for the pan adjust because I find that those controls are=20 prety much set and forget. If you want digital control, use digital potentiometers. In this=20 case, both pan and level adjustments are done with whatever user=20 interface you desire. Regardless, I don't understand the need to=20 digitize the audio signals in order to manipulate levels. I can provide you with assistance with the transmit portion of your=20 project but that would need to be done off-list - the stuff that I=20 have developed is proprietary and not for public dissemination. dwayne --=20 Dwayne Reid Trinity Electronics Systems Ltd Edmonton, AB, CANADA (780) 489-3199 voice (780) 487-6397 fax www.trinity-electronics.com Custom Electronics Design and Manufacturing --=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 .