ArduinoUno a 12 volt

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voglio realizzare un progettino per un termocamino e ho bisogno di alimentare un relè attuatore 12 volt e avendo disposizione un alimentatore swtiching 12volt 2a volevo collegare arduino e vari relè tutto 12 volt ...ovvero sò che arduino può essere collegato sul connettore plug che conduce al regolatore di tensione 5volt ma ho notato che quest'ultimo si scalda parecchio e allora ho pensato di ridurre la tensione direttamente dall'esterno con un 7808 1a che dovrebbe far sudare di meno il 7805 bordo dell' arduino 1...

potrebbe andare ?? accetto consigli molto più tecnici della mia trovata...grazie...

ciao,
rischio di dire blasfemie (non son un tecnico elettronico), ma far scaldare il regolatore non è la corrente (1 o 2a non cambia), ma la tensione.



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