In another thread, I mentioned that I had made my own current tracer probe similar to the HP547A:
https://forum.allaboutcircuits.com/...-i-certainly-should-have-known-better.146232/

I figure I hijacked that thread enough and that I should start a new one.

Well, I actually found some documentation from way back in 1993. I have attached scans of my notes for your amusement. Be warned that the MC1350 -- which is the heart of the circuit -- appears to no longer be available from distributors.

 

For anyone wanting to reproduce what I built, I found a few of the MC1350's at Jameco:

https://www.jameco.com/z/MC1350P-On...3w0Ar6FyiKLCplI6_8wQmKHzbV6g7gyRoCYkoQAvD_BwE

They are pricey but only 2 are needed.

Something I should have noted is that my circuit was hand wired on a copper clad perf board. All of the ground connections solder directly to the copper clad. This is very important.

If there is any interest I will try converting the circuit to more readily available parts.


I got bored and did a simulation of the circuit using the MC1350's: