Electronics > Projects, Designs, and Technical Stuff
Isolated differential probe
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David Hess:

--- Quote from: johnwa on March 29, 2017, 07:38:57 am ---Interesting to see that they used two (presumably matched) optocouplers, rather than something like an IL300.
--- End quote ---

I assume that either the IL300 and similar linear optocouplers were not available then or lacked the required performance.  The parts list says that the optocouplers were screened and matched.


--- Quote ---I remember seeing something similar in an oscilloscope Z mod circuit, where the DC was used to offset the ground of an HV supply, but a capacitive bypass was required for the high frequencies.
--- End quote ---

Transformer and charge pump based DC restorer circuits all work that way simply because they require an output capacitor to filter their ripple.  Even simple level shift circuits often have an AC bypass capacitor to preserve high frequency response.
Ghizz02:
Hi, I really like your work.
I was wondering if it was possible for you to share some informations about your differential probe.
I would really like to build a couple for personal use and after seeing all other designs your is the best option.
Thanks.
eric appla:
Hi, I hope youre still around on EEVblog, this is pretty much ideal probe I'm after, would you mind sharing gerber file and it looks like you 3D printed the enclosure I would most welcome if you could share the file too. Im even haoppy to pay for it, its spot on beautiful small and simple yet it has quite good parameters
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