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Interesting and valuable project indeed :) some questions on my first build. What type of FET is critical for the circuit to work? The IRFZ44V is not common in large parts of world anymore, the STP55NF06L I had at hand obviously not working (logic FET). Regarding the R2 how low can the value be set? Low value=low output amps? If the tone is not produced=not working circuit? my inductors is contracting heavily without any tone. Thanks for the good work and excellent presentation!
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