From: nbowler@draconx.ca   
      
   On 2023-08-16, Bob Engelhardt wrote:   
   >> You could buy or build a differential probe.   
   >>   
   >> If you only wanted to see one trace ...   
   >   
   > Differential probe:  too much (this is just a lower-level hobby).  Whole   
   > point is to see both signals.   
      
   I think a big reason differential probes cost so much is because they are   
   usually designed for mains voltage applications and are therefore built to   
   meet various electrical safety standards (CAT ratings, etc.).   
      
   If you don't care about this safety aspect (e.g., you're probing some low   
   voltage electronics) there appears to be some mass-produced ~US$50 option   
   readily available on aliexpress (no clue about its quality).   
      
   If you are not too fussed about probe performance then maybe you can just   
   hack together something on the bench.  Perhaps a very simple opamp   
   differential amplifier circuit like this one will fill the bill:   
      
     https://www.electronics-tutorials.ws/opamp/opamp_5.html   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)