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DIY Active Differential Probe Project
Active Probe Setup (via xellers)
Active Probe Setup (via xellers)

Back when I worked for an Oscilloscope company, we were pretty proud of our differential probes.  Even the “low-bandwidth” probes were still around 1GHz of bandwidth.

Daniel Kramnik built an active differential probe and looks like he is seeing about 400MHz usable bandwidth.  And really, it looks relatively flat.  Not bad for a DIY effort.  I’m impressed.

Pretty amazing to think about the possibility of building your own (active) scope probes.

Read his full writeup.

Fan of making things beep, blink and fly. Created AddOhms. Writer for News. Freelance electronics content creator for hire! KN6FGY and, of course, bald.


  1. Hi, with your experience in probe design, is there any comment you would like to do for people who want to make it ? Is there anything easy that can be done to improve Daniel’s design ? It would be great if probe designer could help this project gets to 1Ghz … Thank you !!

    • I wasn’t directly involved in probe design, so I couldn’t offer specific tips. But when talking to the probe teams, it was a matter of mechanical and electrical black magic. Historically, designers would do an electrical design and then let the mechanical team figure out how to package it. We found both took hand-in-hand design.

      1GHz was like the sound barrier. It takes a certain level of capability to get there.

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