?Don
If you would like to try signal tracing
Here is a? very nice PC soundcard oscilloscope for win XP and above
As you know surface mount components are packed tight
Be careful probing
I use a hat pin, small sharp point so not to skip off component es short to another,? plastic knob so personal contact does not introduce noise or 60 Hz junk
https://www.zeitnitz.eu/scope_en
It is also dual channel with a spectrum analyzer and sweep generator? And Free
72 73
John
N3AAZ
