Device noise
Hi,
I'm using several AMs in USB mode, attached to mini PCs that are simultaneously recording video with scientific cameras. One AM and one camera per mini PC.
My issue is that, when the cameras are running, there's electronic noise that shows up in the 50-55 kHz range. This is a challenge because the noise is quite robust, and is right where some rodent USVs are that I'm collecting. This noise does not seem to be mechanical (doesn't change when I move the AM closer to or further from the camera, and also adding ferrite clips to all the wires has no effect), rather, it seems to be an issue of running the two devices out of the same computer.
Has anyone solved this before? I'm wondering if running the AMs off of independent power supplies would help - is this possible while still using the micro USB to record in USB mode? Otherwise, I'm fresh out of ideas...
Any help would be greatly appreciated!
Thanks,
Patrick
I have experienced similar effects using microphones on a laptop computer and having te power supply attached. I had a battery that was good enough so ran from that to get a clean signal but I know there are USB filter boards on the market that could help but. You could try them on both the camera and microphone connection but also try an other power supply. If the loads increases on the power supply by adding the camera also the power supply can become more noisy. (and maybe even try a filter board on the power supply cable). If you want to tinker yourself, a small resistor (just a few ohms) in the powerline and a big electrolytic capacitor behind it over + and - would probably help a lot more than just a ferrite.