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Any one have a clue how this coil would be made?
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It's probably quite a simple probe, I imagine it's an axial leaded inductor, probably less than 220 microhenry. I built a cheap version myself last year, and wondered if I could sell them. I did some research and found it was already available.
Mine was based loosely on the EPE magazine (Scarborough) BFO mini-pinpointer project, with a 220 uH inductor approx 2mm diameter, 5mm long. It worked OK, it needed to be within 5mm of the target to signal. I was going to have a 125mm long probe on mine, with the electronics in the 'handle', making it compact. And mine cost a lot less than 400 dollars! -
Here is a bit more on them. The company seems to done the dead bug.
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Homefire,
This unit was made by James Ott. He put a lot of time, money and effort into the finished product. Well engineered the probe tip was diamond I believe. It was pulse induction and had a special ferrite core inductor with the ends ground to 45 degree angles. This allowed the user to rotate the probe to give an indication of direction "Periscope". It had some ferrous/ non ferrous discrimination. Don't know how effective? Unfortunately he passed away a few years after it hit the market. see attached patent for details.Comment
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The detector is nothing special really , I was just wondering how the Prob was able to be Directional.
Ends of Ferrite cut to Angle. LOL Simple and Good Idea.
As to the Write Up, Yes they used Zirconium on the Tip.
Thank You!
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Carl Moreland published 4 patents for Periscope in the Geotech page:
6326790, 6452396, 6456079 and 6529007
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