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Random photo
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Commutation des sortie et gestion des ventilateurs
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Une nouvelle carte électronique vient se ficher sur la carte de gestion des alimentations présentée plus tôt. Cette carte possède plusieurs fonctions intéressantes :
- commutation de plusieurs systèmes de haut-parleurs avec coupure de la haute tension lors des transitions pour éviter de claquer un transformateur de sortie ;
- commutation sur une charge résistive en cas de fonctionnement sans haut-parleur ;
- gestion de la mise en parallèle de deux paires de haut-parleurs avec division de l'impédance par deux vue de la sortie des transformateurs ;
- test de la présence ou non des haut-parleurs ;
- contrôle de la température de l'électronique avec gestion de quatre ventilateurs (vitesse commandée en fonction de la température).
Cette carte est nettement plus simple que la carte de gestion des alimentations car l'automate est bien plus trivial. On y trouve néanmoins un composant que j'affectionne tout particulièrement, le transistor unijonction qui rend bien des services.
Fig. 1 : petite image pour la route.
Aucun commentaire pour le moment
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