Mixed signal project

B

bdoan

Well-known member
I am using a Teensy 4.1 and Audio Adapter on a test fixture design.

I will be measuring audio signal level (with the Audio Adapter -> USB audio), as well as measuring logic levels and analog voltages with the 4.1.

My question is, should I use the USB 5V to power the 4.1 or a common 5V supply that also powers the device under test?
 
It depends on the quality you need or desire. The audio adapter is not a high quality measurement device and mixed signals can cause noise. PCB ground design and separation of power sources is limited when using these existing boards.

Not sure what the best solution really is. I would simply try it.

Another problem can be from the USB data connection to the computer. That can also introduce noise. I don't know if there is an easy solution to isolate that USB connection better.
 
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