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My question is: Is there a way to shield a ferrite rod coil for use in a probe so only the end is sensitive, and not the entire length of the rod?
Bacground info: This picture is a "Wild Planet" toy detector. The original round coil is bottom center of the pic. The detector has a dial to turn on-off/adjust sensitivity, red and green lights to indicate a signal, and a speaker to indicate a signal.
To convert to a probe, I took the ferrite rod antenna from an old radio and used it to replace the original round coil. The ferrite rod has about 200 windings on the larger coil, and about 20 on the smaller coil. Oddly enough--considering that I know nothing about electronics--this coil works just fine. Now I'm wondering, before I stick this contraption into some sort of tubing/housing, if I can make the coil sensitive only towards the tip?
Bacground info: This picture is a "Wild Planet" toy detector. The original round coil is bottom center of the pic. The detector has a dial to turn on-off/adjust sensitivity, red and green lights to indicate a signal, and a speaker to indicate a signal.
To convert to a probe, I took the ferrite rod antenna from an old radio and used it to replace the original round coil. The ferrite rod has about 200 windings on the larger coil, and about 20 on the smaller coil. Oddly enough--considering that I know nothing about electronics--this coil works just fine. Now I'm wondering, before I stick this contraption into some sort of tubing/housing, if I can make the coil sensitive only towards the tip?