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Contents de Radiofil magazine 85
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Infos :
Sommaire des anciens numéros de Radiofil magazine

Outspokenness :
Mieux que l’obsolescence programmée : le blocage de l’utilisation by Daniel Werbrouck.
On parle de plus en plus, dans les médias, d’entreprises industrielles qui étudient et fabriquent des équipements en pensant dès leur conception à une réduction délibérée de leur durée de vie, soit en choisissant des composants à la fragilité « contrôlée », soit en prévoyant une non-évolution de leur environnement (taille mémoire trop faible et fermée, technologie non évolutive, etc.).

Realization :
Un amplificateur stéréo à tubes ECL86 en push-pull by Hubert Abels.
Having to hand a set of output transformers and a mains transformer, left over from a large scrap Telefunken receiver, why not use them to build a valve amplifier. The amplifier in this receiver had employed ECL86’s in push-pull mode. These valves will therefore be used in the mockup, the goal being to build an amplifier aimed at easy listening via an FM tuner or a CD reader, and to use a maximum of salvaged or readily available parts.
Un ersatz de tube A409 by Jacques Mahieux.
It is easy to construct a substitute to replace a receiver valve for a radio. On the other hand, in my case, it was difficult to find bases for European valves. Thanks to the helpfulness of the Radiofil « Boutique Tubes » (Valve Shop), I was able to source four, salvaged from scrap valves.

In the course of Web :
Émetteur simple à deux transistors

History of men :
La guerre maritime pendant la Première Guerre mondiale by Serge Huart.
At the outbreak of war in 1914, Britain has the largest naval fleet, with Germany and Austria second in size, with lesser tonnage. The French fleet consisted of many old and disparate ships. It would not take part in any of the great naval battles. Great Britain and Germany continued, throughout the conflict, to build naval ships, with Germany also building many submarines. In France, the renewal of the fleet was planned for 1914. This was put on hold at the outbreak of war and the naval shipyards were reconverted to produce land weapons.

History of techniques :
Examen d’un module d’unité centrale IBM de 1954 à huit tubes by Guy De Visch.
In the 50’s, IBM’s valve-based computers consisted of plug-in modules, each one comprising of eight valves and their respective components. I recently found one of these modules and have studied the circuits. This particular module uses five debouncing circuits for contacts, used to “clean” the signal coming from a key, a switch or a relay.
Les instruments de musique électroniques by Tony Luzy.
La découverte de l’électricité. Instruments électrostatiques du XVIIIe siècle.
Allow us to stray somewhat from the confines of the usual activities of our association and no longer look just at the reproduction of sound, but at its production, by means of equipment using one or more electronic circuits for producing sound : electronic music instruments. From a passive role, the user becomes active, in other words, rather than receiving or reproducing sounds produced or transmitted by others, he becomes the author : able to record and transmit but also to play and even create music.

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