Deprecated: Calling get_class() without arguments is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/_core/model/dataobjects/_dataobjectcache.class.php on line 234
Deprecated: Creation of dynamic property FiletypeCache::$mimetype_cache is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/files/model/_filetypecache.class.php on line 71
Deprecated: Creation of dynamic property calendar_plugin::$classfile_path is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/plugins/model/_plugins.class.php on line 413
Deprecated: Creation of dynamic property calendar_plugin::$dbtable is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/plugins/_calendar.plugin.php on line 53
Deprecated: Creation of dynamic property calendar_plugin::$dbprefix is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/plugins/_calendar.plugin.php on line 54
Deprecated: Creation of dynamic property calendar_plugin::$dbIDname is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/plugins/_calendar.plugin.php on line 55
Deprecated: Calling get_class() without arguments is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/_core/model/dataobjects/_dataobjectcache.class.php on line 248
Deprecated: Calling get_class() without arguments is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/_core/model/dataobjects/_dataobjectcache.class.php on line 248
Deprecated: Creation of dynamic property Calendar::$dbtable is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/plugins/_calendar.plugin.php on line 508
Deprecated: Creation of dynamic property Calendar::$dbprefix is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/plugins/_calendar.plugin.php on line 509
Deprecated: Creation of dynamic property Calendar::$dbIDname is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/plugins/_calendar.plugin.php on line 510
Deprecated: Creation of dynamic property ItemQuery::$dbtablename is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/items/model/_itemquery.class.php on line 78
Deprecated: Creation of dynamic property ItemQuery::$dbprefix is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/items/model/_itemquery.class.php on line 79
Deprecated: Creation of dynamic property ItemQuery::$dbIDname is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/items/model/_itemquery.class.php on line 80
Deprecated: Creation of dynamic property Calendar::$ItemQuery is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/plugins/_calendar.plugin.php on line 518
Deprecated: Creation of dynamic property Calendar::$linkpostcellstart is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/plugins/_calendar.plugin.php on line 589
Deprecated: Creation of dynamic property Calendar::$linkposttodaycellstart is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/plugins/_calendar.plugin.php on line 590
Deprecated: Creation of dynamic property Calendar::$todaycellstart is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/plugins/_calendar.plugin.php on line 591
Deprecated: Creation of dynamic property Calendar::$todaycellstartpost is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/plugins/_calendar.plugin.php on line 592
Deprecated: Creation of dynamic property Calendar::$postcount_month_atitle is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/plugins/_calendar.plugin.php on line 606
Deprecated: Creation of dynamic property Calendar::$postcount_month_atitle_one is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/plugins/_calendar.plugin.php on line 607
Deprecated: Creation of dynamic property Calendar::$postcount_year_atitle is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/plugins/_calendar.plugin.php on line 608
Deprecated: Creation of dynamic property Calendar::$postcount_year_atitle_one is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/plugins/_calendar.plugin.php on line 609
Deprecated: Calling get_class() without arguments is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/_core/model/dataobjects/_dataobjectcache.class.php on line 248
Deprecated: Calling get_class() without arguments is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/_core/model/dataobjects/_dataobjectcache.class.php on line 248
Deprecated: Calling get_class() without arguments is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/_core/model/dataobjects/_dataobjectcache.class.php on line 281
Deprecated: Creation of dynamic property Form::$form_name is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/_core/ui/forms/_form.class.php on line 146
Deprecated: Creation of dynamic property Form::$form_action is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/_core/ui/forms/_form.class.php on line 147
Deprecated: Creation of dynamic property Form::$form_method is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/_core/ui/forms/_form.class.php on line 148
Deprecated: Creation of dynamic property Form::$enctype is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/_core/ui/forms/_form.class.php on line 149
Deprecated: Creation of dynamic property Form::$layout is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/_core/ui/forms/_form.class.php on line 279
Deprecated: Creation of dynamic property Form::$template is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/_core/ui/forms/_form.class.php on line 283
Deprecated: Creation of dynamic property Form::$formclass is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/_core/ui/forms/_form.class.php on line 284
Deprecated: Creation of dynamic property Form::$formstart is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/_core/ui/forms/_form.class.php on line 285
Deprecated: Creation of dynamic property Form::$title_fmt is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/_core/ui/forms/_form.class.php on line 286
Deprecated: Creation of dynamic property Form::$no_title_fmt is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/_core/ui/forms/_form.class.php on line 287
Deprecated: Creation of dynamic property Form::$no_title_no_icons_fmt is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/_core/ui/forms/_form.class.php on line 288
Deprecated: Creation of dynamic property Form::$group_begin is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/_core/ui/forms/_form.class.php on line 289
Deprecated: Creation of dynamic property Form::$group_end is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/_core/ui/forms/_form.class.php on line 290
Deprecated: Creation of dynamic property Form::$fieldset_title is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/_core/ui/forms/_form.class.php on line 291
Deprecated: Creation of dynamic property Form::$fieldset_begin is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/_core/ui/forms/_form.class.php on line 292
Deprecated: Creation of dynamic property Form::$fieldset_end is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/_core/ui/forms/_form.class.php on line 293
Deprecated: Creation of dynamic property Form::$fieldstart is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/_core/ui/forms/_form.class.php on line 294
Deprecated: Creation of dynamic property Form::$labelclass is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/_core/ui/forms/_form.class.php on line 295
Deprecated: Creation of dynamic property Form::$labelstart is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/_core/ui/forms/_form.class.php on line 296
Deprecated: Creation of dynamic property Form::$labelend is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/_core/ui/forms/_form.class.php on line 297
Deprecated: Creation of dynamic property Form::$labelempty is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/_core/ui/forms/_form.class.php on line 298
Deprecated: Creation of dynamic property Form::$inputstart is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/_core/ui/forms/_form.class.php on line 299
Deprecated: Creation of dynamic property Form::$inputend is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/_core/ui/forms/_form.class.php on line 300
Deprecated: Creation of dynamic property Form::$infostart is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/_core/ui/forms/_form.class.php on line 301
Deprecated: Creation of dynamic property Form::$infoend is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/_core/ui/forms/_form.class.php on line 302
Deprecated: Creation of dynamic property Form::$fieldend is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/_core/ui/forms/_form.class.php on line 303
Deprecated: Creation of dynamic property Form::$buttonsstart is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/_core/ui/forms/_form.class.php on line 304
Deprecated: Creation of dynamic property Form::$buttonsend is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/_core/ui/forms/_form.class.php on line 305
Deprecated: Creation of dynamic property Form::$customstart is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/_core/ui/forms/_form.class.php on line 306
Deprecated: Creation of dynamic property Form::$customend is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/_core/ui/forms/_form.class.php on line 307
Deprecated: Creation of dynamic property Form::$note_format is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/_core/ui/forms/_form.class.php on line 308
Deprecated: Creation of dynamic property Form::$bottom_note_format is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/_core/ui/forms/_form.class.php on line 309
Deprecated: Creation of dynamic property Form::$formend is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/_core/ui/forms/_form.class.php on line 310
Deprecated: Creation of dynamic property Form::$fieldstart_checkbox is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/_core/ui/forms/_form.class.php on line 336
Deprecated: Creation of dynamic property Form::$fieldend_checkbox is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/_core/ui/forms/_form.class.php on line 337
Deprecated: Creation of dynamic property Form::$inputclass_checkbox is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/_core/ui/forms/_form.class.php on line 338
Deprecated: Creation of dynamic property Form::$inputstart_checkbox is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/_core/ui/forms/_form.class.php on line 339
Deprecated: Creation of dynamic property Form::$inputend_checkbox is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/_core/ui/forms/_form.class.php on line 340
Deprecated: Creation of dynamic property Form::$checkbox_newline_start is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/_core/ui/forms/_form.class.php on line 341
Deprecated: Creation of dynamic property Form::$checkbox_newline_end is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/_core/ui/forms/_form.class.php on line 342
Deprecated: Creation of dynamic property Form::$checkbox_basic_start is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/_core/ui/forms/_form.class.php on line 343
Deprecated: Creation of dynamic property Form::$checkbox_basic_end is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/_core/ui/forms/_form.class.php on line 344
Deprecated: Creation of dynamic property Form::$fieldstart_radio is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/_core/ui/forms/_form.class.php on line 346
Deprecated: Creation of dynamic property Form::$fieldend_radio is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/_core/ui/forms/_form.class.php on line 347
Deprecated: Creation of dynamic property Form::$inputclass_radio is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/_core/ui/forms/_form.class.php on line 348
Deprecated: Creation of dynamic property Form::$inputstart_radio is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/_core/ui/forms/_form.class.php on line 349
Deprecated: Creation of dynamic property Form::$inputend_radio is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/_core/ui/forms/_form.class.php on line 350
Deprecated: Creation of dynamic property Form::$radio_label_format is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/_core/ui/forms/_form.class.php on line 351
Deprecated: Creation of dynamic property Form::$radio_newline_start is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/_core/ui/forms/_form.class.php on line 352
Deprecated: Creation of dynamic property Form::$radio_newline_end is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/_core/ui/forms/_form.class.php on line 353
Deprecated: Creation of dynamic property Form::$radio_oneline_start is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/_core/ui/forms/_form.class.php on line 354
Deprecated: Creation of dynamic property Form::$radio_oneline_end is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/_core/ui/forms/_form.class.php on line 355
Deprecated: Calling get_class() without arguments is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/_core/model/dataobjects/_dataobjectcache.class.php on line 248
Deprecated: Creation of dynamic property coll_category_list_Widget::$excluded_cat_IDs is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/widgets/widgets/_coll_category_list.widget.php on line 236
Deprecated: Creation of dynamic property ItemQuery::$dbtablename is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/items/model/_itemquery.class.php on line 78
Deprecated: Creation of dynamic property ItemQuery::$dbprefix is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/items/model/_itemquery.class.php on line 79
Deprecated: Creation of dynamic property ItemQuery::$dbIDname is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/items/model/_itemquery.class.php on line 80
Deprecated: strpos(): Passing null to parameter #1 ($haystack) of type string is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/items/model/_itemquery.class.php on line 1418
Deprecated: Creation of dynamic property ItemLight::$objtype is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/items/model/_itemlight.class.php on line 164
Deprecated: Creation of dynamic property ItemLight::$datestart is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/items/model/_itemlight.class.php on line 175
Deprecated: Creation of dynamic property FiletypeCache::$mimetype_cache is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/files/model/_filetypecache.class.php on line 71
Deprecated: strtotime(): Passing null to parameter #1 ($datetime) of type string is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/files/model/_file.class.php on line 1015
Random photo
 |
Alimentations
Deprecated: Creation of dynamic property Item::$cache_has_content_parts is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/items/model/_item.class.php on line 4911
Deprecated: Creation of dynamic property smilies_plugin::$classfile_path is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/plugins/model/_plugins.class.php on line 413
Deprecated: Creation of dynamic property quicktags_plugin::$classfile_path is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/plugins/model/_plugins.class.php on line 413
Deprecated: Creation of dynamic property archives_plugin::$classfile_path is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/plugins/model/_plugins.class.php on line 413
Deprecated: Creation of dynamic property archives_plugin::$dbtable is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/plugins/_archives.plugin.php on line 54
Deprecated: Creation of dynamic property archives_plugin::$dbprefix is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/plugins/_archives.plugin.php on line 55
Deprecated: Creation of dynamic property archives_plugin::$dbIDname is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/plugins/_archives.plugin.php on line 56
Deprecated: Creation of dynamic property email_elements_plugin::$classfile_path is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/plugins/model/_plugins.class.php on line 413
Deprecated: Creation of dynamic property financial_contribution_plugin::$classfile_path is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/plugins/model/_plugins.class.php on line 413
Deprecated: Creation of dynamic property ping_b2evonet_plugin::$classfile_path is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/plugins/model/_plugins.class.php on line 413
Deprecated: Creation of dynamic property ping_pingomatic_plugin::$classfile_path is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/plugins/model/_plugins.class.php on line 413
Deprecated: Creation of dynamic property auto_p_plugin::$classfile_path is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/plugins/model/_plugins.class.php on line 413
Deprecated: Creation of dynamic property texturize_plugin::$classfile_path is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/plugins/model/_plugins.class.php on line 413
Deprecated: Creation of dynamic property nofollow_plugin::$classfile_path is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/plugins/model/_plugins.class.php on line 413
Deprecated: Creation of dynamic property content_blocks_plugin::$classfile_path is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/plugins/model/_plugins.class.php on line 413
Deprecated: Creation of dynamic property Item::$renderers_validated is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/items/model/_item.class.php on line 11107
Deprecated: Creation of dynamic property Item::$pages is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/items/model/_item.class.php on line 2412
Deprecated: strtr(): Passing null to parameter #1 ($string) of type string is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/_core/_misc.funcs.php on line 766
Deprecated: strtr(): Passing null to parameter #1 ($string) of type string is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/_core/_misc.funcs.php on line 766
Deprecated: Creation of dynamic property ItemSettings::$count_col_key_names is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/settings/model/_abstractsettings.class.php on line 121
Après quelques longs mois d'absence pour raisons plus ou moins professionnelles, j'ai enfin pu remettre la main à mes alimentations haute tension.
Il n'y a pas à dire, il y a un peu de monde. Il s'agit d'une alimentation à double conversion prenant en entrée 20Vac (ou 28Vdc) et sortant 412V/200W sur deux rails indépendants (pour blocs double monophonique) ainsi qu'une tension de polarisation négative.
Après avoir mis l'engin sous tension avec des lunettes de protection, on ne sait jamais, premières mesures :
Points positifs, les tensions sont correctes. 412V pour l'alimentation haute tension, -57V pour la polarisation. Le bruit est bien hors bande. Les circuits de charge et de décharge sont parfaits : lors de la mise sous tension, les condensateurs de filtrage sont chargés au travers d'une résistance de puissance, lors de la coupure de la source, les condensateurs de filtrage et les condensateurs haute tension sont déchargés en moins de 1s.
Points négatifs, le rendement n'est pas à la hauteur et je n'ai pu tirer plus de 60W du circuit en raison d'une commande un peu faiblarde des MOSFETs de l'onduleur. Le circuit a été modifié en conséquence. Un driver de MOSFET a aussi été rajouté sur la régulation pour obtenir un rendement correct.
Bientôt à la vente sur http://www.systella.fr.
Monde cruel
Deprecated: Creation of dynamic property Item::$cache_has_content_parts is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/items/model/_item.class.php on line 4911
Deprecated: Creation of dynamic property Item::$renderers_validated is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/items/model/_item.class.php on line 11107
Deprecated: Creation of dynamic property Item::$pages is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/items/model/_item.class.php on line 2412
Deprecated: Creation of dynamic property ItemSettings::$count_col_key_names is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/settings/model/_abstractsettings.class.php on line 121
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
Deprecated: Creation of dynamic property Item::$cache_has_content_parts is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/items/model/_item.class.php on line 4911
Deprecated: Creation of dynamic property Item::$renderers_validated is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/items/model/_item.class.php on line 11107
Deprecated: Creation of dynamic property Item::$pages is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/items/model/_item.class.php on line 2412
Deprecated: strtr(): Passing null to parameter #1 ($string) of type string is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/_core/_misc.funcs.php on line 766
Deprecated: Creation of dynamic property ItemSettings::$count_col_key_names is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/settings/model/_abstractsettings.class.php on line 121
Le boîtier avance, doucement...
Commutation des sortie et gestion des ventilateurs
Deprecated: Creation of dynamic property Item::$cache_has_content_parts is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/items/model/_item.class.php on line 4911
Deprecated: Creation of dynamic property Item::$renderers_validated is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/items/model/_item.class.php on line 11107
Deprecated: Creation of dynamic property Item::$pages is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/items/model/_item.class.php on line 2412
Deprecated: strtr(): Passing null to parameter #1 ($string) of type string is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/_core/_misc.funcs.php on line 766
Deprecated: Creation of dynamic property ItemSettings::$count_col_key_names is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/settings/model/_abstractsettings.class.php on line 121
Une nouvelle carte électronique vient se ficher sur la carte de gestion des alimentations présentée plus tôt. Cette carte possède plusieurs fonctions intéressantes :
- commutation de plusieurs systèmes de haut-parleurs avec coupure de la haute tension lors des transitions pour éviter de claquer un transformateur de sortie ;
- commutation sur une charge résistive en cas de fonctionnement sans haut-parleur ;
- gestion de la mise en parallèle de deux paires de haut-parleurs avec division de l'impédance par deux vue de la sortie des transformateurs ;
- test de la présence ou non des haut-parleurs ;
- contrôle de la température de l'électronique avec gestion de quatre ventilateurs (vitesse commandée en fonction de la température).
Cette carte est nettement plus simple que la carte de gestion des alimentations car l'automate est bien plus trivial. On y trouve néanmoins un composant que j'affectionne tout particulièrement, le transistor unijonction qui rend bien des services.
Fig. 1 : petite image pour la route.
Avancement du boîtier
Deprecated: Creation of dynamic property Item::$cache_has_content_parts is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/items/model/_item.class.php on line 4911
Deprecated: Creation of dynamic property Item::$renderers_validated is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/items/model/_item.class.php on line 11107
Deprecated: Creation of dynamic property Item::$pages is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/items/model/_item.class.php on line 2412
Deprecated: strtr(): Passing null to parameter #1 ($string) of type string is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/_core/_misc.funcs.php on line 766
Deprecated: Creation of dynamic property ItemSettings::$count_col_key_names is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/settings/model/_abstractsettings.class.php on line 121
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.
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 ($limit) of type int is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/_core/_param.funcs.php on line 2201
Deprecated: preg_split(): Passing null to parameter #3 ($limit) of type int is deprecated in /export/home/bertrand/web/blog/b2evolution/blogs/inc/_core/_param.funcs.php on line 2201
1 2 3 4 5 ...6 ...7 8 9 10 >>