Nanoammeter

I've mentioned microammeter add-ons before:

https://wb9kzy.blogspot.com/2022/04/microammeter-add-on-circuit-for-dvm.html 

and

https://wb9kzy.blogspot.com/2022/04/microammeter-dvm-add-on-part-2.html 

Recently in addition to searching the web for technical topics I've also started searching Youtube.  Seems like there are a number of folks on Youtube doing technical videos - maybe to monetize their info ?  Doesn't really matter, I tried searching Youtube for nanoammeter (actually started with picoammeter but that seemed way too fussy and microammeter results in a lot of old videos about D'Arsonval meters).  This is in reference to this recent post:

https://wb9kzy.blogspot.com/2025/04/current-measurements-on-ldo-regulators.html

Anyway, I thought this design was interesting, for one thing: no bi-polar supply (or op-amp) required:

source: https://www.youtube.com/watch?v=kKWA4L_ZaI0

A clever video !  I've got to try it.

Best Regards,
Chuck, WB9KZY
http://wb9kzy.com/ham.htm