Originally Posted By: tfabris
Okay, I tried going the other way with the [I2S] voltage dividers.

Instead of the prior 4.7k/10k which would have resulted in 2.25v from a 3.3v input, I tried 10k/10k which results in 1.65v from a 3.3v input.


Okay, most humble apologies are in order.
After failing to discern the I2S output voltages from either the schematic or the datasheet, it finally dawned on me that I have the means to actually measure them. Quite accurately.

I am seeing around +6V on those lines. Which is pretty amazing given that they come directly from the empeg's DSP chip, which is mostly a 3.3V part. But it does have 5V power as well, and the 5V must be a bit closer to 6V I guess.

So.. dividing it in half (10K/10K) is absolutely the correct thing to do here. And my misinterpretation of the output is undoubtedly what fried your first two boards. My bad. frown

My preference is always to measure when possible, rather than theorize. But measuring voltage of a rapidly changing digital output is difficult. Unless one has an oscilloscope. Just didn't think of using the darned thing. Until now.