thank you for those links. I'll check if I can get information about the USB audio input part out of it.
Any hints about using a headphone with only the internal OpAmp?
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about using a headphone with only the internal OpAmp a little discussed here:
and It seems nobody succeeded in transfer the project https: //www.element14.com/ ...
to the new version of PSoC Creator ((
my apologies for the late reply. Here's an update about the headphone circuit:
currently I'm using the iDAC as a signal generator, current strength is 2mA. Resistor value is choosen so that the maximum voltage is about 0.78V (390 Ohm), so there's a peak voltage of 0.39V. This voltage is connected to two internal OpAmps (for left/right channel) in follower mode and then output to OpAmp output pins. A 100µF series capacitor for each channel is connected between output pin and headphone connector to eliminate DC part of the signal.
This seems to work in general, I'm using 32 Ohm headphones and a sinus test signal with 1kHz (512 samples).