I discovered that one of my IB metal detector designs had more than 100 000 views on YouTube alone. I further had a look now for one of my CCO metal detector designs. I was surprised to find that it had more than 20 000 views on YouTube. OBSERVATION: Here is a CCO design (above) which I did merely for demonstration, not for performance. However, the CCO principle is capable of high performance -- the best. I think that people may not yet have woken up to this. It is also much easier to set up than IB, while it rivals IB. It is a new genre, of which I am (was) the inventor. Elektor made that claim, and nobody disputed it.