I mentioned that I was working on a dual-channel metal detector. Today, with a dozen components, I built a dual channel prototype that is able to detect a Victorian penny (just) at 250 mm, and a pin (just) at 100 mm -- and it is solid -- there is very little drift. This is very good -- however, intuitively, I feel that it is far short of potential. At this stage, frequency lock has stopped me. In other words, reality is overpowering my theory. OBSERVATION: The currents causing frequency lock are so tiny, I am not convinced I shall overcome the problem. They are unmeasurable on my oscilloscope. I only see the symptoms.
Tuesday, December 20, 2022
Frequency Lock
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