I have built HH , and it works very well ,but I must work on stability and sensitivity, I need more sensitivity on copper , bronze coins !!!, somebody told me to build a "fast coil" ,300-350uH coil not 500uH ! , what value of R11 I need to dump 320uH coil sorry of my english , I am Croatian , any suggestions are wellcome
best regards
z
best regards
z
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