Target identification by time constant

[Tinkerer]

With a traditional PI we measure the amplitude of the target response.
Much is to be gained by measuring also the target TC.
The best way to do this would be by digital signal processing. However, I found that a programmer needs to understand a function well in order to write good code...

[nick_f]

Hi Guys,

I played with a Matchless metal detector circuit, designed by Rev Thomas Scarborough.
I modified a few things and it started working better. It is far away from the performance of Hammerhead, but I bet it works better than some other metal detector projects.
I uploaded...