emmanuel63
Well-known member
Hello,
I have made a few projects and I can't get the audio output completely free of noise. I use teensy 3.5 or 3.6 plus audioShield.
I have read many threads and try hard to avoid ground loops, but my output (or input) is never completely quiet, even with battery operated projects.
For exemple, I have connected the audio output from a pro audio mixer to the line input of the Teensy audioBoard. I monitor the line input with the peak object to trigger events when audio is detected. Dealing with low threshold levels is hard due to constant noise. My mixer is a good one, and it is grounded. I have also tried with a battery powered mixer (a professional one) but I still have some noise. I have checked mixers output and it is free of noise.
I certainly miss something somewhere, so I need guidance to solve this problem. The noise sounds like "digital noise" : high pitch noise, fast small cracks, no hum.
I have in my "junk box" a pair of Jensen audio transformers. How can I wire them to isolate completely the audio input of the teensy ?
Emmanuel
I have made a few projects and I can't get the audio output completely free of noise. I use teensy 3.5 or 3.6 plus audioShield.
I have read many threads and try hard to avoid ground loops, but my output (or input) is never completely quiet, even with battery operated projects.
For exemple, I have connected the audio output from a pro audio mixer to the line input of the Teensy audioBoard. I monitor the line input with the peak object to trigger events when audio is detected. Dealing with low threshold levels is hard due to constant noise. My mixer is a good one, and it is grounded. I have also tried with a battery powered mixer (a professional one) but I still have some noise. I have checked mixers output and it is free of noise.
I certainly miss something somewhere, so I need guidance to solve this problem. The noise sounds like "digital noise" : high pitch noise, fast small cracks, no hum.
I have in my "junk box" a pair of Jensen audio transformers. How can I wire them to isolate completely the audio input of the teensy ?
Emmanuel