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Planet Analog - All Signal No Noise. Dangerous Prototypes | A new open source hardware project every month. Fast & reliable news for the electronics industry. Forum Electronique. Dépannage des circuits électroniques. Le dépannage en électronique Mise à jour le 17 septembre 2007 Introduction : Vous allez me dire: "C'est facile de faire du dépannage lorsque l'on a une formation avancée de technicien dépanneur et dix ans de métier derrière soit ! Et puis quand c'est en panne il faut utiliser un matériel élaboré et malgré cela les pannes sont compliquées à trouver et difficile à réparer; ce sont rien que des composants microscopiques et introuvables sur le marché" Et bien non, je n'ai rien de tout cela, et pourtant j'y arrive bien ! ...Ma parole, on croirait lire un livre sur la méditation !! Beaucoup d'appareils en panne, et ce, encore à l'heure actuelle, (mis à par les marques dites "inconnues" à pas cher), méritent de se faire réparer.

La fonction test diode. Méthodologie de recherche d'une panne : Observez les symptômes de la panne. Caractéristiques des pannes pour un type de composant électronique donné : Introduction : Les contacteurs, interrupteurs, potentiomètres et relais : ESA/Hubble. Www.thetubestore.com - Your online source for audio vacuum tubes. Amplified Parts. The National Valve Museum. B&H Photo Video Digital Cameras, Photography, Camcorders. The Sun’s Magnetic Field is About to Flip. Something big is about to happen on the sun. According to measurements from NASA-supported observatories, the sun’s vast magnetic field is about to flip.

“It looks like we’re no more than 3 to 4 months away from a complete field reversal,” says solar physicist Todd Hoeksema of Stanford University. “This change will have ripple effects throughout the solar system.” A new ScienceCast video anticipates the reversal of the sun’s global magnetic field. Play it The sun’s magnetic field changes polarity approximately every 11 years. Hoeksema is the director of Stanford’s Wilcox Solar Observatory, one of the few observatories in the world that monitor the sun’s polar magnetic fields. Solar physicist Phil Scherrer, also at Stanford, describes what happens: “The sun’s polar magnetic fields weaken, go to zero, and then emerge again with the opposite polarity.

A reversal of the sun’s magnetic field is, literally, a big event. During field reversals, the current sheet becomes very wavy. Credits: Tout-electromenager.fr - Informations & depannage electromenager. The world's largest professional association for the advancement of technology. Arduino - HomePage. Sparkfun.com electronic parts. Force Sensitive Resistor - Square. Description: This is a force sensitive resistor with a square, 1.75x1.5", sensing area. This FSR will vary its resistance depending on how much pressure is being applied to the sensing area. The harder the force, the lower the resistance. When no pressure is being applied to the FSR its resistance will be larger than 1MΩ.

This FSR can sense applied force anywhere in the range of 100g-10kg. Two pins extend from the bottom of the sensor with 0.1" pitch making it bread board friendly. There is a peel-and-stick rubber backing on the other side of the sensing area to mount the FSR. These sensors are simple to set up and great for sensing pressure, but they aren't incredibly accurate. Dimensions: Overall length: 3.5" Overall width: 1.75" Sensing area: 1.75x1.5" Documents: Rupert Neve Designs. Buy Cheap - Buy Cheap China Products at Wholesale Prices | Everbuying.com. Audit. L'Electrosmog: Comment le contrôler & le maitriser. Doté des équipements, dûment étalonnés, parmi les plus récents et les plus perfectionnés, Hypercable vous propose un audit environnemental "électrosmog" rapide, couvrant de 100 KHz à 60 GHz, permettant ainsi d'apprécier la vraie valeur cumulée de l'Electrosmog total.

Hypercable propose des bornes autonomes et automatiques pour les mesures et l'enregistrement en continu des champs radio électriques. Autonomes, grâce à un panneau solaire intégré, téleconsultables via un modem GSM, ces bornes peuvent également déclencher une alerte par détection de seuils de niveaux préprogrammés. Cliquez ici pour en savoir plus sur l'électrosmog. Lien avec l'aimable autorisation de l'OFEV (Office Federal de l'Environnement de la Confédération Suisse). Téléchargez les dossiers L'électrosmog dans l'environnement Comparaison des Protocoles de Mesure ANFR et INERIS Le Protocole INERIS Comprendre le 0,6V/m par Electrosmog.info Laboratoires d'essais accrédités Effets.

Distributeur international de matériels électroniques, électriques et MRO | Farnell Belgique. Test and Measurement Equipment. Amplifiers, Most Musical Amplifiers. Russell O. Hamm Journal of The Audio Engineering Society Presented September 14, 1972, at the 43rd Convention of the Audio Engineering Society, New York Engineers and musicians have long debated the question of tube sound versus transistor sound. As recording engineers we became directly involved with the tube sound versus transistor sound controversy as it related to pop recording. During one session in a studio notorious for bad sound we plugged the microphones into Ampex portable mixers instead of the regular console. Anyone who listens to phonograph records closely can tell that tubes sound different from transistors. Electrical engineers, especially the ones who design recording equipment, can prove that there is no difference in tube or transistor sound.

Psychoacoustically, musicians make more objective subjects than engineers. "Tube records have more bass....The bass actually sounds an octave lower," says one rock guitarist. Fig. 1. Vacuum tube. Modern vacuum tubes, mostly miniature style In electronics, a vacuum tube, electron tube (in North America), tube, or thermionic valve or valve (in British English) is a device controlling electric current through a vacuum in a sealed container. The simplest vacuum tube, the diode, contains only two elements; current can only flow in one direction through the device between the two electrodes, as electrons emitted by the hot cathode travel through the tube and are collected by the anode, or in conventional current terms, anode to cathode.

Addition of a third and additional electrodes allows the current flowing between cathode and anode to be controlled in various ways.[1] The device can be used as an electronic amplifier, a rectifier, an electronically controlled switch, an oscillator, and for other purposes. Vacuum tubes mostly rely on thermionic emission of electrons from a hot filament or a cathode heated by the filament. Classifications[edit] Other classifications are: Diodes[edit]