Sorry for resurrecting the thread, I have connected AREF And AVCC pins to Vcc.
And have made a synth with dual pwm audio output, when MIDI INPUT is received it makes a crackle noise.
Here is the schematic:
It's very thin but it's there at the output, also is most noticeable at those 2 "green font markers with arrows" above
Could it be AREF and AVCC reason??? I tryed to RC low pass filtering them but it didn't do anything.
Thanks!