Réduction du bruit
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L'alimentation régulée présentée hier fournit une tension régulée et filtrée de bonne qualité pour les filaments de chauffage. Néanmoins, l'ajout de condensateurs sur les diodes rapides de redressement et d'une bobine sans ferrite permet de supprimer toute ronflette qui pourrait être réinjectée sur les masses par le bruit de commutation des diodes.
Par ailleurs, ces alimentations sont commandées au travers de relais. L'ajout d'un condensateur au primaire du transformateur devrait éviter de trop forts arcs électriques lors de l'ouverture du circuit. Voici donc les circuits modifiés.
Fig. 1 : alimentation des filaments des tubes de basses puissances (en grand)
Fig. 2 : alimentation des filaments des tubes de puissance (en grand)
Aucun commentaire pour le moment
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