[sdiy] sniffing

[Czech Martin]

As a magnetic field probe I just used a roll of isolated wire (cord),
about 20 loops. In the way this wire is sold, I had simply to cnnect the ends.

Perhaps for higher frequencies only one loop would be better.

But how can you build a low cost E field probe?

Perhaps an aluminum ball? Where goes ground in this case?
Or two balls forming a dipole?
Perhaps a jfet could be used to buffer the high impedance in this case?


m.c.