Hi!
I work with a Teensy 4, an audio shield, an amplifier and a Benewake TFMINI-S Micro LIDAR (UART), 18V battery and 2 step down regulators (step down to 12V for the amplifier and 5V for the Teensy). I am playing a sound from the SD card and change the volume with the LIDAR. I get lots of noise, a hiss and kind of a square wave tone.
Any idea of what can cause that noise and what I could do to stop or filter that noise?
Thank you!
I work with a Teensy 4, an audio shield, an amplifier and a Benewake TFMINI-S Micro LIDAR (UART), 18V battery and 2 step down regulators (step down to 12V for the amplifier and 5V for the Teensy). I am playing a sound from the SD card and change the volume with the LIDAR. I get lots of noise, a hiss and kind of a square wave tone.
- When I don't use the amplifier and use headphones, I have no noise.
- When I use a power supply instead of the battery, it does not stop the noise.
- When I unplug the LIDAR and play some sounds from the SD some of the noise stops, but not all of it.
- When I use two batteries (one for the Teensy, one for the amplifier), I have no noise.
- When I use two batteries but link the Teensy's ground to the amplifier's ground, some of the noise is back
- When I play a hardware test beep (no SD, no LIDAR), I have no noise.
- I tried a couple of different step down regulators with the same result. This one and this one
Any idea of what can cause that noise and what I could do to stop or filter that noise?
Thank you!