Andy Belov
Well-known member
I have 3 Adafruit_MPR121 capacitive sensors and a touch screen with my Teensy 4.0.
When I touch or release the screen or the sensors, I hear a pretty loud buzzing sound from the Audio Board, but only when the line input is enabled.
There is no noise when I switch to the microphone.
I have LM358 op amp as a buffer for the guitar input connected to the Audio Board "line in". The preamp is not screened at all, bare bones.
The screen is Paul's ILI9341.
What can I do to reduce the noise? The
Thank you.
When I touch or release the screen or the sensors, I hear a pretty loud buzzing sound from the Audio Board, but only when the line input is enabled.
There is no noise when I switch to the microphone.
I have LM358 op amp as a buffer for the guitar input connected to the Audio Board "line in". The preamp is not screened at all, bare bones.
The screen is Paul's ILI9341.
What can I do to reduce the noise? The
Thank you.