In my electronics live I had a lot of situations when I can’t open device.
Why? Because people didn’t see difference:
Look and remember.
Why my screws are broken?
S parameters – scattering matrix
Scattering matrix can show us quality of the antena link or cable link between the ports.
BluePill USB Grabber v1.0
The best known interface is USB. I show in this article, how to connect and catch data from STM32 bluepill board in 15 minutes.
Electromagnetic field meter part 2
In this part I added block schematic and electric schematics