Hi there,
I am experiencing high-pitched noise over both the line-out and the headphone jack of the SGTL5000 audioshield. The sound that is programmed to be there comes through too, but there is just this lasting high-pitch in the back (It seems very much in line with the power supplying my LED matrices). Maybe someone has some more knowledge about this and could advise me. I've had a tip about using audio ground-loop isolators. However, the pitch is there both when I plug in externally powered speakers and using my headphones. So I assume that my headphones won't create a ground loop.
An explanation of my setup;
I have a Teensy 4.0 hooked up to a Raspberry pi 4 (Broken out RX/TX pins -> FTDI converter -> USB cable -> Raspberry Pi). The power to the Teensy, the audioshield SGTL5000, and an XBee along with some indicator-LEDs is also coming through this USB cable and distributed over a custom PCB. The Raspberry Pi itself is powered by a 5V power supply that also powers a whole lot of LED matrixes. This particular power supply powers the Raspberry pi and 8 32x64 matrixes. Though the Raspberry Pi also PWM's another 16 of those matrixes (total of 49152 leds distributed over 3 power supplies).
Thanks in advance!
I am experiencing high-pitched noise over both the line-out and the headphone jack of the SGTL5000 audioshield. The sound that is programmed to be there comes through too, but there is just this lasting high-pitch in the back (It seems very much in line with the power supplying my LED matrices). Maybe someone has some more knowledge about this and could advise me. I've had a tip about using audio ground-loop isolators. However, the pitch is there both when I plug in externally powered speakers and using my headphones. So I assume that my headphones won't create a ground loop.
An explanation of my setup;
I have a Teensy 4.0 hooked up to a Raspberry pi 4 (Broken out RX/TX pins -> FTDI converter -> USB cable -> Raspberry Pi). The power to the Teensy, the audioshield SGTL5000, and an XBee along with some indicator-LEDs is also coming through this USB cable and distributed over a custom PCB. The Raspberry Pi itself is powered by a 5V power supply that also powers a whole lot of LED matrixes. This particular power supply powers the Raspberry pi and 8 32x64 matrixes. Though the Raspberry Pi also PWM's another 16 of those matrixes (total of 49152 leds distributed over 3 power supplies).
Thanks in advance!