În locul unei diode Zener pentru stabilizarea tensiunii, se poate monta cu succes şi o joncţiune a unui tranzistor, aşa cum se vede în fig. 18. Transformatorul Tr este de sonerie, redresorul cuplîndu-se la borna de 8 V. Cele 4 diode redresoare sînt DR 304, D 7 J sau echivalente. Cu acest montaj se poate alimenta un aparat de radio tip „Zefir”.
Tranzistorul EFT 131 se poate înlocui cu AC 180, EFT 323, MP 42 etc.
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