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Random photo
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Alimentations
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Après quelques longs mois d'absence pour raisons plus ou moins professionnelles, j'ai enfin pu remettre la main à mes alimentations haute tension.
Il n'y a pas à dire, il y a un peu de monde. Il s'agit d'une alimentation à double conversion prenant en entrée 20Vac (ou 28Vdc) et sortant 412V/200W sur deux rails indépendants (pour blocs double monophonique) ainsi qu'une tension de polarisation négative.
Après avoir mis l'engin sous tension avec des lunettes de protection, on ne sait jamais, premières mesures :
Points positifs, les tensions sont correctes. 412V pour l'alimentation haute tension, -57V pour la polarisation. Le bruit est bien hors bande. Les circuits de charge et de décharge sont parfaits : lors de la mise sous tension, les condensateurs de filtrage sont chargés au travers d'une résistance de puissance, lors de la coupure de la source, les condensateurs de filtrage et les condensateurs haute tension sont déchargés en moins de 1s.
Points négatifs, le rendement n'est pas à la hauteur et je n'ai pu tirer plus de 60W du circuit en raison d'une commande un peu faiblarde des MOSFETs de l'onduleur. Le circuit a été modifié en conséquence. Un driver de MOSFET a aussi été rajouté sur la régulation pour obtenir un rendement correct.
Bientôt à la vente sur http://www.systella.fr.
Monde cruel
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Il n'y a pas à dire, le monde du tube électronique est plein de bricoleurs. Certains, sans aucun complexe, se permettent même de vous apprendre votre métier alors qu'ils devraient vraiment faire attention à l'endroit où ils mettent les pattes.
Sur un forum, je suis tombé sur un individu me prenant de haut parce que j'avais osé dire qu'une E80F n'était pas une EF86 mais une EF80 à tolérance spéciale. Je n'avais pas ouvert mes docs, j'avais dit cela de mémoire. Mais j'ai une excellente mémoire et, une chose est sûre, dans un poste Grundig des années 1950, j'ai remplacé des E80F qui étaient câblées comme des EF80 (en particulier le branchement du filament) par, justement, des EF80. Une autre chose est sûre, l'E80F standard de la grande époque est brochée comme une EF86.
J'ai donc battu ma coulpe, rien n'y a fait. Ce ne serait pourtant par la première fois que je tombe sur des tubes avec un pinout sortant des sentiers battus. En effet, j'ai une boîte de NE407 fabriquées pour Radio Canada qui ne sont pas des 407 classiques, deux broches sont inversées. Dans le monde moderne des transistors, cela arrive aussi de temps en temps. Rien à fait, mon interlocuteur me soutient mordicus qu'une E80F remplace directement et en mieux une EF86.
Sauf que ce n'est pas vrai. Si la transconductance est la même entre les deux tubes, le point de polarisation n'est pas du tout le même (le courant au repos de l'une est 50% supérieur à celui de l'autre). Cela déplace un tout petit peu le point de fonctionnement, un tout petit peu, et on peut obtenir assez rapidement des choses bizarres. J'ai donc sorti les datasheets des deux tubes, exposé en quoi les deux tubes étaient différents, rien à faire. J'ai sorti les réglages de mon lampemètre pour les deux tubes, même réaction. Il faut dire que la personne en question essayait de vendre des E80F et qu'il était très intéressant de dire que c'était des tubes parfaitement identiques aux EF86 mais en mieux. Forcément, ce que je pouvais dire risquant de mettre la puce à l'oreille du chaland, je dérangeais.
Pire, en remplaçant une EF86 par une E80F, on peut avoir un meilleur résultat. Mais par hasard, du fait du changement du point de fonctionnement du tube. Là, on entre dans des grands débats idiophiles permettant de savoir si tel tube est meilleur que tel autre, si les NOS sont meilleurs que la fabrication courante et j'en passe. Il est juste impossible de comparer une EF86 et une E80F sans refaire la polarisation du circuit.
Chose amusante, le même individu a demandé comment tester un tube de sa collection sur son lampemètre Métrix. Je vous le donne en mille, le tube était un thyratron, ce qui prouve le sérieux de cette personne et ses connaissances approfondies des tubes électroniques. Ce qui rend a posteriori très savoureux le fait de se faire traiter de buse par cette personne et sa garde rapprochée.
Des nouvelles du boîtier
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Le boîtier avance, doucement...
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.
Avancement du boîtier
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Les dimensions des cartes électroniques étant de plus en plus connues, le boîtier peut commencer à avancer parallèlement à la conception électronique.
En voici la première ébauche. Le boîtier sera constitué de trois pièces. Deux pièces en tôle d'inox traitées et pliées et une face avant sans doute en aluminium.
Restent à faire les ouies pour l'aération, les ouvertures pour les différentes prises et la face avant.
Restent aussi à ajouter une tôle de blindage à l'intérieur et les différentes fixations des circuits.
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Deprecated: preg_split(): Passing null to parameter #3 ($limit) of type int is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/_core/_param.funcs.php on line 2201
Deprecated: preg_split(): Passing null to parameter #3 ($limit) of type int is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/_core/_param.funcs.php on line 2201
Deprecated: preg_split(): Passing null to parameter #3 ($limit) of type int is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/_core/_param.funcs.php on line 2201
Deprecated: preg_split(): Passing null to parameter #3 ($limit) of type int is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/_core/_param.funcs.php on line 2201
Deprecated: preg_split(): Passing null to parameter #3 ($limit) of type int is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/_core/_param.funcs.php on line 2201
Deprecated: preg_split(): Passing null to parameter #3 ($limit) of type int is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/_core/_param.funcs.php on line 2201
Deprecated: preg_split(): Passing null to parameter #3 ($limit) of type int is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/_core/_param.funcs.php on line 2201
Deprecated: preg_split(): Passing null to parameter #3 ($limit) of type int is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/_core/_param.funcs.php on line 2201
Deprecated: preg_split(): Passing null to parameter #3 ($limit) of type int is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/_core/_param.funcs.php on line 2201
Deprecated: preg_split(): Passing null to parameter #3 ($limit) of type int is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/_core/_param.funcs.php on line 2201
Deprecated: preg_split(): Passing null to parameter #3 ($limit) of type int is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/_core/_param.funcs.php on line 2201
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