Utilizînd înfăşurarea de 6,3 V de la încălzirea filamentelor tuburilor electronice dîntr-un aparat, se poate construi un alimentator stabilizat pentru tranzistoare (fig. 21). Redresorul utilizează două diode F 057 într-un montaj dublor de tensiune.
Stabilizatorul de tensiune foloseşte ca element serie de reglare tranzistorul AC 180 K, iar ca amplificator de eroare tranzistorul BC 107, BC 108 etc., luînd ca referinţă tensiunea diodei Zener DZ 306.
Rotind cursorul potenţiometrului de 1 kΩ, la ieşire tensiunea variază între 8 V şi 14 V. Acest alimentator poate debita 500 mA, dar dacă în locul tranzistorului AC 180 K se montează AD 155 (cu radiator), curentul poate creşte pînă la 1 A.
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