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Loubardes

Nouvelles transitions

par Le Grincheux  


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En gardant les mêmes notations qu'à l'article transitions, la nouvelle table de vérité est la suivante :

Entrées Sorties
Q2 Q1 Q0 I PBT PHT C15 C255 Q'2 Q'1 Q'0 J2 K2 J1 K1 J0 K0
X X X X X X X
1 X X X X 1 X X 1 X
1 X X X X  0 X X X 1
1 1 X X X 1 X X X
1 1 X 1 X 1 1 1 1 X 1 X X
1 1 1 X 1 X 1 X 1 X X 1
1 X X X X  0 X X 1 X
1 1 X X X 1 1 1 1 X X 1 X
1 1 1 X X 1 X X X
1 1 1 X X 1 1 1 X X 1 X
1 1 X X X X 1 1 1 1 X X X
1 1 X 1 1 X 1 1 1 1 X X X
1 1 X 1 X X 1 1 X X X
1 1 X 1 1 1 X 1 1 X X 1 X 1
1 1 1 X X 1 1 1 X 1 X 1 X
1 1 1 X X 1 1 1 X 1 X 1 X
1 1 X X 1 1 1 X 1 X 1 X
1 1 1 1 X X 1 X X X
1 X X X X 1 1 X X 1 X
1 1 1 X X X X 1 X X X 1
1 1 1 X 1 X 1 X X 1
1 1 1 X 1 1 X X X
1 1 X X X 1 1 X 1 X X 1
1 1 1 1 X X 1 1 X 1 X X 1
1 1 X X X X 1 1 X X X
1 1 1 X X X X 1 1 1 X X 1 X
1 1 1 1 X X X X 1 1 1 X X X
1 1 1 X X X X X 1 X 1 X 1

Tab. 1 : table de vérité du nouvel automate

Contrairement à la première table de vérité, les entrées J et K des bascules utilisent maintenant des états indifférents notés « X » qui devraient simplifier d'autant la synthèse du circuit logique.

De la pratique du placebo chez l'idiophile, saison 2

par Le Grincheux  


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Dans la série consistant à étudier la pratique du placebo dans un certain milieu, voici la suite de mes pérégrinations dans le monde hostile des fous furieux et prétendument audiophiles — ce sont eux qui le disent — qui hantent les nombreux forums internet et qui n'ont pas tout compris. Les fous furieux, pas les forums.

Fig. 1 : stabilisation

Je suppose que tout est bien stable. Mais alors, pour faire la poussière dans les alvéoles des briques, cela ne doit pas être simple. Quant aux enceintes, elles sont elles aussi posées sur un support bien stable, support d'ailleurs isolé de l'enceinte par un morceau qui ressemble à s'y méprendre à un bout de mélaminé dont la section m'incite à penser que sa fréquence de résonnance n'a pas été étudiée avec attention. Personnellement, j'aurais plutôt opté pour une gueuse de fonte ou une compression de César, une question de formation, sans doute.

Fig. 2 : pied à la Philippe Starck

Il est dommage de ne pas avoir de photographies de l'installation électrique. J'aurais souhaité savoir si la personne en question avait bourré ses prises murales à l'aide de béton vibré pour éviter que les câbles électriques ne bougent.

Nouvel automate à états finis

par Le Grincheux  


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Une nouvelle transition permet de rallumer la haute tension dans la phase d'extinction lorsque la basse tension est encore présente. Un nouvel état appelé « défaut ext » permet de maintenir le voyant « défaut » allumé en cas de défaillance du système lors de son extinction. Pour réinitialiser l'automate, il faut faire un va-et-vient du bouton marche/arrêt.

Fig. 1 : nouvel automate à états finis (la même en grand)

Les nouveaux tableaux de Karnaugh sont donc les suivants :

Q2 Q1Q0
  00 01 11 10
1 1 1
1 1 1

Tab. 1 : variable basse tension (B)

B = (Q1+Q0)Q2+Q2Q1

Q2 Q1Q0
  00 01 11 10
1
1 1

Tab. 2 : variable haute tension (H)

H = Q2Q1Q0+Q2Q0Q1

Q2 Q1Q0
  00 01 11 10
1
1 1 1 1

Tab. 3 : reset compteur (R)

R = Q1Q0+Q2Q1

Q2 Q1Q0
  00 01 11 10
1 1 1

Tab. 4 : défaut (E)

E=Q2Q1

Compte tenu des équations précédentes, la logique reliant les sorties Qi des trois bascules aux quatre sorties de l'automate est la suivante :

Fig. 2 : logique de sortie (la même chose en grand)

De la pratique du placebo chez l'idiophile, saison 1

par Le Grincheux  


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Je viens de tomber sur le texte suivant. Âmes sensibles et physiciens s'abstenir de lire car c'est du très lourd, je ne voudrais pas être responsable d'années de thérapies.

Je cite donc avec des pincettes et en corrigeant les fautes d'orthographe  :

Les fréquences aiguës se déplacent plus vite, plus librement, quand la résistance est la plus faible, c'est-à-dire à l'extérieur du câble. Mais le brin qui se situe à l'extérieur va bouger sans cesse entre l'intérieur et l'extérieur. Donc les fréquences aiguës vont sauter en permanence d'un brin à l'autre pour rester toujours à l'extérieur. Sinon, elles sont ralenties par rapport aux fréquences graves, et on constate un décalage, qui donne une impression audible de perte de précision et de flou. Pour pouvoir sauter ainsi d'un brin à l'autre en douceur, sans perte, il faut que rien ne vienne gêner ce transfert et donc surtout pas d'oxydation. Autre facteur, les cristaux. Un câble en cuivre est composé de cristaux (1500 par 30cm pour un cuivre très pur) que le courant traverse. Chaque passage d'un cristal à l'autre génère une distorsion qui sera d'autant plus importante que le câble aura été fondu en présence d'oxygène qui favorise la formation de dioxydes. Donc les câbles sérieux sont traités anti-oxydation, tout simplement (ouf !)

Sans commentaire. Mais si un vendeur peut fournir un tel câble à plusieurs milliers d'euros le mètre, je comprends qu'il ne s'en prive pas.

Transitions

par Le Grincheux  


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Dans l'article précédent figurent les équations de sortie de l'automate. Ce nouvel article explicte les transitions permettant de passer d'un état à un autre. Les sorties Qi des bascules sont conformes à la notation déjà utilisée. Quant aux entrées Ji et Ki, elles correspondent aux bascules de sorties Qi. Les entrées auxiliaires sont notées :

  • PBT : présence de toutes les tensions de chauffage ;
  • PHT : présence de la haute tension ;
  • C15 : compteur valant exactement 15 ;
  • C255 : compteur valant exactement 255.
Entrées Sorties
Q2 Q1 Q0 I PBT PHT  C15 C255 J2 K2 J1 K1 J0 K0
 0  0  0  X X  X X 1 1 1
 0  0  0 1 X  X  X X  0 1 1 1
 0  1 X X X X  0 1 1 1
 0  0  1  1 X X  X  0 1 1 1
 0  1  1  X  1  X  1 1 1
 0  0  1  1  1  X 1 X  0 1 1 1
 0  1  0  X  X  X  X  0 1 1 1
 0  1  0 1  0 X X X 1 1 1
 0  1  0  1 1  X  X  0  0 1  1 1
1 1 1 X X 1 1 1 1
1 1 X X X X 1 1 1
1 1 X 1 1 X 1 1 1
1 1 X 1 X X 1 1 1
1 1 X 1 1 1 X 1 1 1
1 1 1 X X 1 1 1
1 1 1 X X 1 1 1
1 1 X X 1 1 1
1 1 1 1 X X 1 1 1
1 X X X X 1 1 1
1 1  X  1  0 X  0  1 1 1
1 1 X 1 X 1 1 1 1
1 1 X X X X 1 1 1
1 1 X 1 1 X X 1 1 1
1 1 1 1 X X X X 1 1 1
1 1 1 X X X X 1 1 1

Tab. 1 : transitions d'états

Les cases entourées de rouge sont celles correspondant à un défaut de fonctionnement indiqué comme tel. À noter :  l'automate est conçu de telle sorte qu'une fois la procédure d'extinction lancée, les alimentations s'arrêtent totalement. Il est envisageable d'ajouter une transition supplémentaire pour éviter l'extiction en cas de réenclenchement du bouton marche/arrêt.

De la même manière, un défaut lors de la phase d'extinction provoque un passage par l'état 111 qui n'est pas maintenu car I vaut zéro. Il est possible d'ajouter un état 110 correspondant à un défaut durant la procédure d'extinction.

Ces deux améliorations feront l'objeet d'un prochain article.


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