I would like to make something similar to the old HP current tracer.
Page 6 shows the concept behind the probe tip.
http://www.hpl.hp.com/hpjournal/pdfs/IssuePDFs/1976-12.pdf
Any suggestions on how to make the tip part?
Figure 6 of that document.
How to make the ferrite 1.5mm "H" component?
Find some old computer core memory?!
More realistically the smallest ferrite bead you can find and carefully grind
it to a C shaped profile (carefully with a Dremel and alumina grinding tool?
- don't inhale the dust!)
Then very fine wire for the coil. Pass result to broadband video amp chip perhaps?
Interesting project, I am tempted to try myself.
[ Actually, a brainwave - use a floppy disc drive magnetic head! About the right
size I'd think ]
More realistically the smallest ferrite bead you can find and carefully grind
it to a C shaped profile (carefully with a Dremel and alumina grinding tool?
- don't inhale the dust!)
Then very fine wire for the coil.
Got some results:
I had a 2 mm by 5 mm bead/rod.
I cut of 1 mm with the suggested Dremel using diamond cut off wheel. Then had 2 mm X 1 mm core.
10 raps of #40 wire with a bit of glue.
Then I cut off some of the core so it looks like a C
Put input into comparator 339.
Fig. 34
Going to do some work on a pre-amp.
[ Actually, a brainwave - use a floppy disc drive magnetic head! About the right
size I'd think ]
I like this.
Good idea will have to try this also.