On Tue, Dec 23, 2008 at 11:22 AM, Michael Algernon wrote: > Do you have an oscilliscope that will measure audio frequencies ? > ( perhaps a sound card scope would even work. ) > You can determine what the signal level is coming out of the DAC. > If you read page 13 of the pdf for the Class D amplifier you will see > you have the option of single or differential inputs. > > If you want to mix the output of the DAC with an aux input you will > have to add an op amp in my opinion. Heh now why didn't I think of that. Yes, I have a scope, and yes I should have a look at the signal. I'm in the midst of about 1000 things but I will try my best to do it soon. I'm not opposed to using an opamp as a buffer, I think I'd prefer to find a single supply one though as I don't think there are negative voltages in there already. Any suggestions? I've used the TL072 before but I seem to recall someone mentioning it isn't the greatest nowadays. Thanks! Josh -- A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools. -Douglas Adams -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist