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problema cu potentiometru de volum

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Scoate de acolo C2 de 100nF si inlocuieste-l cu 100pF. Daca oscileaza, mareste progresiv valoarea pana "tace", dar in nici un caz nu trebuie sa ajungi la 100nF.Sau, mai poti imbunatati punand un pot de valoare mai mica: 5...10K, dar chiar si asa, condul ala de 100nF mi se pare f mare.Cirip

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daca as pune un preamplif as rezolva problema????

Depinde de impedanta de iesire a preamplifului. Daca e mare, nu. Daca e mica, da. Asta presupune cuplaj direct intre preamp si amp, fara pot. Oricum, condul ala de 100n nu are ce cauta acolo. Cel mai usor e sa il scoti si sa vezi ce se intampla, decat sa te complici cu preamplif.

daca da unde leg potentiometrul inainte sau dupa preamp???

Este preferabil ca potul sa-l pui intre preamplif si amplif, deci nu ai rezolvat mare lucru chiar si cu un preamplif cu impedanta de iesire mica.Cirip
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