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Probleme detector metale surf pi!

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Am incercat si eu sa construiesc surf pi-ul dupa cablajul de mai jos!





Dupa finalizare am avut surpriza deja bine stiuta ca nu functioneaza:(se aude bazaitul in continuu);

Am luat la testat cablajul dupa eventualul scurt....nimic!

Am verificat daca piesele sunt unde trebuie...nimic.

Verificat daca la pin 3 (NE555) am un semnal(cu ajutorul unei casti cu un condensator in serie)...si aude un bazait"

Verificat mosfet-ul si parea in regula.

Masurat tensiunile de alimentare ale CI...totul in regula.

Icl-ul imi scoate +5V si -4,78V;

Threshold parca" functioneaza ...scade din intensitatea sonora cand ajustez.

Cand ajustez din delay nu prea obs nimic schimbat.

Cu/fara bobina aceeasi branza:(

De unde ar putea sa apara problema asta?


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