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This OWON DC Power Supply has a small body and is easy to carry due to its light weight. Featuring a 3.7" TFT LCD display, it has a maximum output power of 180 W and a resolution of 1 mV/1 mA. Features Channel Single Channel Output Total Output Power 180 W Channel Output 0 - 60 V / 0 - 3 A × 1-CH Display 3.7' color LCD display Dimension 117 mm(L) × 194 mm(H) × 295 mm(D) Weight Approx. 5.8 kg Interface RS232 Specifications Rated Output (0 ℃ - 40 ℃) Voltage 0 - 60 V Current 3 A Load Regulation Voltage ≤ 0.01% + 3 mV Current ≤ 0.01% + 3 mA Power Regulation Voltage ≤ 0.01% + 3 mV Current ≤ 0.01% + 3 mA Setting Resolution Voltage 1 mV Current 1 mA Readback Resolution Voltage 1 mV Current 1 mA Setpoint accuracy (within 12 months) (25 ℃ ± 5 ℃) Voltage ≤ 0.03% + 10 mV Current ≤ 0.1% + 5 mA Readback Resolution (25 ℃ ± 5 ℃) Voltage ≤ 0.03% + 10 mV Current ≤ 0.1% + 5 mA Ripple/Noise (20 Hz - 20 MHz) Voltage (Vp-p) ≤ 4 mVp-p Voltage (Vrms) ≤ 1 mVrms Current (rms) ≤ 4 mArms Output temperature coefficient(0 ℃ - 40 ℃) Voltage ≤ 0.03% + 10 mV Current ≤ 0.1% + 5 mA Readback temperature coefficient Voltage ≤ 0.03% + 10 mV Current ≤ 0.1% + 5 mA Response Time 100 μs Storage 5 groups of data Working Temperature 0 - 40 ℃

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Arduinonext is an initiative powered by an electronics and microcontrollers specialist team aiming to help all those who are entering in the technology world, using the well-known Arduino platform to take the next step in electronics. We strive to bring you the necessary knowledge and experience for developing your own electronics applications; interacting with environment; measuring physical parameters; processing them and performing the necessary control actions. This is the first title in the 'Hands-On' series in which Arduino platform co-founder, David Cuartielles, introduces board programming, and demonstrates the making of an 8-bit Sound Generator.

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Inhalt Grundlagen Kathodengegenkopplung – bei Endröhren durch eine Übertragerwicklung Der Zwischenübertrager Bauanleitungen Eintakt-A-Endstufe mit 4x 6V6 – 6V6 quatroSE – ernsthafter Eintakter mit 16 W, nicht nur für hocheffiziente Lautsprecher CD-Vorverstärker mit CD-Filter Moderne Hybridendstufe Die Kathedrale in der Streichholzschachtel – Elektronische Hallspirale UKW-Mischteil – mit der Doppeltriode ECC2000 und der Triode/Pentode ECF80 Technik In die Röhre geschaut – Computer-tomografische Bilder vom Röhreninneren 6L6GC – with best Regards from the United States of America Röhrensockel Info Die Röhren-Sonderheft-Reihe hat die runde Zahl 10 erreicht Nachruf Jan Jurco – Gründer von JJ Electronic Buchbesprechung Röhrendaten

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World’s Most Popular ROS Platform TurtleBot is the most popular open source robot for education and research. The new generation TurtleBot3 is a small, low cost, fully programmable, ROS based mobile robot. It is intended to be used for education, research, hobby and product prototyping. Affordable Cost TurtleBot was developed to meet the cost-conscious needs of schools, laboratories and companies. TurtleBot3 is the most affordable robot among the SLAM-able mobile robots equipped with a 360° Laser Distance Sensor LDS-01. ROS Standard The TurtleBot brand is managed by Open Robotics, which develops and maintains ROS. Nowadays, ROS has become the go-to platform for all the roboticists around the world. TurtleBot can be integrated with existing ROS-based robot components, but TurtleBot3 can be an affordable platform for whom want to get started learning ROS. Extensibility TurtleBot3 encourages users to customize its mechanical structure with some alternative options: open source embedded board (as a control board), computer and sensors. TurtleBot3 Waffle Pi is a two-wheeled differential drive type platform but it is able to be structurally and mechanically customized in many ways: Cars, Bikes, Trailers and so on. Extend your ideas beyond imagination with various SBC, sensors and motors on a scalable structure. Modular Actuator for Mobile Robot TurtleBot3 is able to get a precise spatial data by using 2 DYNAMIXEL’s in the wheel joints. DYNAMIXEL XM series can be operated by one of 6 operating modes (XL series: 4 operating modes): Velocity control mode for wheels, Torque control mode or Position control mode for joint, etc. DYNAMIXEL can be used even to make a mobile manipulator which is light but can be precisely controlled with velocity, torque and position control. DYNAMIXEL is a core component that makes TurtleBot3 perfect. It is easy to assemble, maintain, replace and reconfigure. Open Control Board for ROS The control board is open-sourced in hardware wise and in software wise for ROS communication. The open source control board OpenCR1.0 is powerful enough to control not only DYNAMIXEL’s but also ROBOTIS sensors that are frequently being used for basic recognition tasks in cost effective way. Various sensors such as Touch sensor, Infrared sensor, Color sensor and a handful more are available. The OpenCR1.0 has an IMU sensor inside the board so that it can enhance precise control for countless applications. The board has 3.3 V, 5 V, 12 V power supplies to reinforce the available computer device lineups. Open Source The hardware, firmware and software of TurtleBot3 are open source which means that users are welcomed to download, modify and share source codes. All components of TurtleBot3 are manufactured with injection molded plastic to achieve low cost, however, the 3D CAD data is also available for 3D printing. Specifications Maximum translational velocity 0.26 m/s Maximum rotational velocity 1.82 rad/s (104.27 deg/s) Maximum payload 30 kg Size (L x W x H) 281 x 306 x 141 mm Weight (+ SBC + Battery + Sensors) 1.8 kg Threshold of climbing 10 mm or lower Expected operating time 2h Expected charging time 2h 30m SBC (Single Board Computers) Raspberry Pi 4 (2 GB RAM) MCU 32-bit ARM Cortex-M7 with FPU (216 MHz, 462 DMIPS) Remote Controller RC-100B + BT-410 Set (Bluetooth 4, BLE) Actuator XL430-W210 LDS (Laser Distance Sensor) 360 Laser Distance Sensor LDS-01 or LDS-02 Camera Raspberry Pi Camera Module v2.1 IMU Gyroscope 3 AxisAccelerometer 3 Axis Power connectors 3.3 V/800 mA5 V/4 A12 V/1 A Expansion pins GPIO 18 pinsArduino 32 pin Peripheral 3x UART, 1x CAN, 1x SPI, 1x I²C, 5x ADC, 4x 5-pin OLLO DYNAMIXEL ports 3x RS485, 3x TTL Audio Several programmable beep sequences Programmable LEDs 4x User LED Status LEDs 1x Board status LED1x Arduino LED1x Power LED Buttons and Switches 2x Push buttons, 1x Reset button, 2x Dip switch Battery Lithium polymer 11.1 V 1800 mAh / 19.98 Wh 5C PC connection USB Firmware upgrade via USB / via JTAG Power adapter (SMPS) Input: 100-240 VAC 50/60 Hz, 1.5 A @maxOutput: 12 VDC, 5 A Downloads ROS Robot Programming GitHub E-Manual Community

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The State of Hollow State Audio in the Second Decade of the 21st Century Vacuum-tube (or valve, depending upon which side of the pond you live on) technology spawned the Age of Electronics early in the 20th Century. Until the advent of solid-state electronics near mid-century, hollow-state devices were the only choice. But following the invention of the transistor (after their process fell to reasonable levels), within a couple of decades, the death of vacuum tubes was widely heralded. Yet here we are some five decades later, and hollow-state equipment is enjoying something of a comeback, especially in the music and high-end audio industries. Many issues surround hollow-state audio: Does it produce—as some claim—better sound? If so, is there science to back up these claims? How do hollow-state circuits work? How do you design hollow-state audio circuits? If hollow-state equipment fails, how do you go about troubleshooting and repairing it? Can we recreate some of the classic hollow-state audio devices for modern listening rooms and recording studios? How can we intelligently modify hollow-state amplifiers to our taste? These and other topics are covered in The State of Hollow State Audio.

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This book is about teaching the Python programming language using the Raspberry Pi 4 computer. The book makes an introduction to Raspberry Pi 4 and then teaches Python with the topics: variables, strings, arrays, matrices, tuples, lists, dictionaries, user functions, flow of control, printing, keyboard input, graphics, GUI, object oriented programming and many more topics. The book is aimed for beginners, students, practising engineers, hobbyists, and for anyone else who may want to learn to program in Python. The book includes many example programs and case studies. All the example programs and case studies have been tested fully by the author and are all working. The example programs aim to teach the various programming concepts of Python. The case studies cover the use of Python in the analysis and design of electronic circuits. Some of the case study topics are: Resistor colour code identification Resistive potential divider circuits Resistive attenuator design Zener diode voltage regulator design RC and RLC transient circuits Circuit frequency response Saving data on external memory stick Mesh and node circuit analysis using matrices Resonance in RLC circuits Transistor Biasing analysis Transistor amplifier design Design of active filters Interfacing hardware with GPIO, I²C and SPI Using Wi-Fi with Python and TCP/IP and UDP programs Using Bluetooth from Python Full program listings of all the programs used in the book are available at the Elektor website of the book. Readers should be able just to copy and use these programs in their Raspberry Pi projects without any modifications.

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Sprachsteuerung von IoT-Projekten mit Amazon Alexa gibt dem Leser einen tiefen Einblick in die Technik der Sprachsteuerung am Beispiel von Amazon Alexa. Es erklärt detailliert Schritt für Schritt, wie man Raspberry Pi, ESP8266/32 und Arduino mit einem Sprachassistenten verbindet und steuert. Dieses geschieht anhand von Projekten aus den Bereichen Hausautomation und Robotik. Der Leser erfährt, wie man Heizkessel, Roboter und Gartenhäuser mit dieser modernen Mensch-Maschine-Schnittstelle kommandieren kann. Der Autor Walter Trojan führt dabei den Leser in die vielschichtige Welt der Amazon Web Services ein, wo er neben dem Alexa Skills Kit weitere Module wie AWS Lambda und IoT Core kennenlernt. Das erwartet den Leser: Kapitel 1: Sprachassistenten setzen sich durch Kapitel 2: Alexa intern Kapitel 3: Der erste Alexa Skill Kapitel 4: Alexa Skills für Fortgeschrittene Kapitel 5: Erster Hardware-Skill auf Raspberry Pi Kapitel 6: Auch Alexa liebt die Arduino-IDE Kapitel 7: Hacks mit Schaltern Kapitel 8: Alexa steuert ein Gartenhaus Kapitel 9: Auch Roboter gehorchen Alexa Kapitel 10: Alexa geht fremd

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Inhalt Röhrentechnik Classic Three Vorverstärker: Gegentaktschaltung mit Kathodenfolger Line-Vorverstärker mit der 6C33: Vorverstärkung mit einer Leistungsröhre? Der Dirigent: Ein Vorverstärker mit aktiver Frequenzweiche Single ended Stereo-Endverstärker KR300B: Die außergewöhnliche 300B 1 Watt Wohnzimmer-Gitarrenverstärker: Röhrensound auch bei kleinen Lautstärken iGoliathSingle ended 211: Eintakt-Triodenverstärker mit 211 Wie funktioniert ein Ausgangstrafo? Lautsprecher Morel Elite 420 von Eltim Audio: Kleine aktive Zweiweg-Kombi mit DSP All Black von Henkjan Olthuis: Breitbänder CSS EL70 mit Transmission-Line HATT-SE Mk. II: Ein kompakter 2-Wege-Monitor mit Seas Excel-Chassis Silverado von Sander Sassen: 2-Weg-D´Appolitomit Seas L12 und 27TB Legno TL von Monacor: Ein FAST-System mit TL-Subwoofer, vollaktiv mit DSP und Klasse-D Wall–i von ASE: Der Bildlautsprecher zur eigenen Gestaltung SAK-PC mit Peerless/Vifa von ASE: Aktiv oder passiv, so oder so PC-optimiert Mini-Wall von Blue Planet Acoustic: An die Wand oder auf den Tisch – beides geht gut mit der kleinen Punktschallquelle. Halbleitertechnik Prelude, der Vorverstärker: Kompromisslos puristisches Design Klick an / Klick aus-Schalter: Die Elektronik für das angemessene Schalten

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Ist es möglich, Fehler in Röhren und Ausgangstrafos spürbar zu kompensieren? Im vorigen Jahrhundert wurden sehr viele Maßnahmen zum Erreichen dieses Ziels entwickelt. Eine dieser Methoden ist in Vergessenheit geraten: Transkonduktanz, was soviel bedeutet wie „Umsetzung von Strom in Spannung” und umgekehrt. Autor Menno van der Veen hat diese Methode wieder zum Leben erweckt und gab ihr den Arbeitstitel „Trans”. Die Hintergründe und Eigenschaften werden genau so sorgfältig beschrieben wie die Fallstricke dieses Verfahrens, die Schritt für Schritt eliminiert werden. Dies führt letztlich zu einer Liste strenger Bedingungen, die von Trans erfüllt werden müssen. Mit diesen Geräten entwickelt er neue Trans-Verstärker, die mit Trans-Mini-1 und Trans-Mini-2 beginnen. Dabei handelt es sich um einfach nachzubauende, DC-gekoppelte Single-Ended-Röhrenverstärker mit ungeahnt guten Eigenschaften. Anschließend wird Trans an Verstärker mit höherer Leistung angepasst. Durch abwechselnde Rückschläge und Erfolge schließlich entsteht der Vanderveen-Trans-30, in welchem das Gute des Trans noch weiter verbessert wurde. Die besonderen Eigenschaften dieses Verstärkers waren es, die Menno van der Veen schließlich zu der Aussage bewogen, „Gold” in seinen Händen zu halten. Mittels Simulation und Vergleich mit anderen Verstärkertypen werden die Trans-Bedingungen erneut überprüft, um sicher zu stellen, dass Abweichungen in den Röhren das optimale Verhalten von Trans nicht beeinflussen. Dieses Buch liest sich wie ein spannender Roman, aber es ist mehr: Eine solide Untersuchung hinsichtlich neuer Methoden zum Erreichen einer optimalen Audiowiedergabe.

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Create Models for 3D Printing, CNC Milling, Process Communication and Documentation Engineers dread designing 3D models using traditional modeling software. OpenSCAD takes a refreshing and completely different approach. Create your models by arranging geometric solids in a JavaScript-like language, and use them with your 3D printer, CNC mill, or process communication. OpenSCAD differs from other design systems in that it uses programmatical modeling. Your model is made up of primitives that are invoked using a C-, Java- or Python-like language. This approach to model design is close to the “mechanical work” done in the real world and appeals to engineers and others who are not a member of the traditional creative class. OpenSCAD also provides a wide variety of comfort functions that break the 1:1 relationship between code and geometry. This book demonstrates the various features of the programming language using practical examples such as a replacement knob for a LeCroy oscilloscope, a wardrobe hanger, a container for soap dispensers, and various other real-life examples. Written by an engineer with over 15 years of experience, this book is intended for Linux and Windows users alike. If you have programming experience in any language, this book will have you producing practical three-dimensional objects in short order!

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Steeds vaker komen we op smartphones en tablet-computers het besturingssysteem Android tegen. Het aantal toepassingsprogramma's – de zogenaamde applicaties of kortweg apps - waarmee de apparaten individueel aan de voorkeuren en wensen van de gebruiker kunnen worden aangepast, neemt van dag tot dag toe. En de steeds betere technische uitvoering en uitrusting van de apparaten maken het nu mogelijk toepassingen te 'draaien' waarvoor een paar jaar geleden nog een desktop-PC of speciale hardware vereist was. Inmiddels kan elke smartphone de exacte (geografische) positie bepalen, video's opnemen – en nog veel meer. Maar bij het individualiseren van onze smartphone hoeven we ons niet te beperken tot kant-en-klare applicaties! Het is namelijk helemaal niet zo moeilijk om zelf Android-apparaten te programmeren en eigen apps te schrijven. Dit boek vormt een inleiding tot het programmeren van apps voor Android-apparaten. De werking van het Android-systeem wordt op begrijpelijke manier uitgelegd en we zien stap voor stap hoe applicaties kunnen worden geprogrammeerd. Aan de hand van een groot aantal voorbeelden worden allerlei toepassingsmogelijkheden getoond. Het scala loopt van eenvoudige rekenprogramma's via het uitlezen van sensoren en GPS-data tot het programmeren van applicaties voor internetcommunicatie. Naast het schrijven van applicaties in de programmeertaal Java wordt in dit boek ook besproken hoe apps met behulp van Javascript of PHP-scripts kunnen worden geprogrammeerd.

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The QAV250 Kit is the perfect way to get started developing on either PX4 or Ardupilot. It pairs a carbon fiber 250 racing frame and essential electronics with Pixhawk 6C mini autopilot. The kit is easy to assemble. No soldering needed. Specifications Micro Power Module (PM06 v2) Motors: 2207 KV1950 Wheelbase: 250 mm Dimensions: 198 x 235 x 70 mm Weight: 347 g Included Carbon fiber 250 airframe with hardware Micro Power Module (PM06 v2) Motors: 2207 KV1950 5' Plastic Props Fully assembled Power Management Board with ESCs (BLHeli S ESC 20A) Battery Straps Note: LiPo battery is not included.

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