Beat Balance Metal Detector?

[Steve in MS]

Anyone heard of this one? It looks really simple, maybe not too good.

http://www.zen22142.zen.co.uk/Circuits/Testgear/bbmd.htm

[goldfinder]

Beat Balance

Hi Steve,
I tried this one. I didn't use a faraday shield and didn't work hardly at all. The shield is probably necessary to keep two coils from influencing each other.
Goldfinder

[Carl-NC]

It was discussed a while back:

https://www.geotech1.com/thuntings/showthread.php?t=12250

[Steve in MS]

Hmm, appears to be a joke. Thanks for the replies.

[Carl-NC]

No, not a joke... it's a real working design.