Ebay Schumann Generator does not generate 7.83 hz. I tested this generator. The R6 pot is supposed to help tune it but it does not , ever, align at 7.83. I managed to get between 7.12 hz and 8.2 / 8.3 hz. It also varies as temperature changes. Secondly, if you look close, there is a blob of solder shorting out the coil.

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