Every electrical current generates a magnetic field, so a non-contact voltage tester can detect current in a conductor without actually touching it, even if the conductor is insulated. It has an ...

It would be interesting to experiment with variations of some of these circuits interfaced to a scope. We’ve seen various types of non-contact voltage and current sensing over the years.

Non-contact voltage probes have been ... but surely it isn’t that hard to detect AC voltage. Turns out there are a lot of circuits floating around that can do it and [nsievers51] tried a bunch.

Test your non-contact voltage tester on a known live circuit to ensure it works. Stick the tester in the smaller slot of your ...