Mine SMW is ready. Very deep, 1 euro coin about 45-50 cm. But discrimination is very bad. It eliminates ferromagnetic metals, but the depth of the non-ferrous metals also drops significantly. I experimented with TL084 LF347 LM324.... TX is 0.8 mH DD from elliptic coil from old project. I can't download less than 10 kHz because the work is inadequate poor .
There is probably something I need to do to improve discrimination.
There is probably something I need to do to improve discrimination.
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