New PI Detector Patent

[Rick K - First Member]

This one by Dave Johnson of First Texas.

of course a patent isn't a product and not every PI detector has ground exclusion and can be useful for nugget hunting - but still.

https://hobby-detecting.com/download/documents/FTH-0005-02-US US9366778.pdf

 

[Steve Herschbach]

This does not look to have anything to do with actual detecting per se and in fact appears to be a renewal of Dave's old method for scavenging flyback energy to extend battery life in PI detectors. A similar method was used in the Fisher Impulse metal detector.