Pentru adaptarea unor traductoare cu impedanta interna mare (microfon piezoelectric, doza de crista, etc) se recomanda ulitizarea montajului prezent in configurare. In figura 1 se poate urmarii schema electrica care contine un tranzistor FET tip BF245 (la intrarea) si un bipolar tip BC 256 (la iesire). Impedanta de intrare este de aproximativ 2 MΩ, fiind determinata in principal de rezistorul R1, Etajul de iesire contine un tranzistor PNP al carui colector este conectat la sursa lui T1. Acest tip de conexiune realizeaza o impedanta mica la iesire ceea ce creeaza posibilitatea adaptarii cu aproape orice tip de amplificator.
In figura 2 se da cablajul imprimat, iar in figura 3 desenul de asamblare a componentelor.
Articol publicat in suplimentul Electronistul – Supliment: 50 scheme electronice si montaje practice
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