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Valve Amplifiers are regarded by many to be the ne plus ultra when it comes to processing audio signals. The combination of classical technology and modern components has resulted in a revival of the valve amplifier. The use of toraidal-core output transformers, developed by the author over the past 15 years, has contributed to this revival. The most remarkable features of these transformers are their extremely wide frequency ranges and their very low levels of linear and nonlinear distortion. This book explains the whys and wherefores of toroidal output transformers at various technical levels, starting with elementary concepts and culminating in complete mathematical descriptions. In all of this, the interactions of the output valves, transformer and loudspeaker form the central theme. Next come the practical aspects. The schematic diagram of a valve amplifier often appears to be very simple at first glance, but anyone who has built a modern valve amplifier knows that a lot of critical details are hidden behind this apparent simplicity. These are discussed extensively, in connection with designs for amplifiers with output powers ranging from 10 to 100 watts. Finally, the author gives some attention to a number of special valve amplifiers, and to the theory and practice of negative feedback. In summary, this book offers innovative solutions for achieving perfect audio quality. Do-it-yourself builders, as well as persons who want to gain a deeper technical understanding of the complex world of audio transformers, valve amplifiers and audio signal processing, will find this book a rich and useful source of information.

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Het boek beschrijft de werking van digitale circuits vanaf schakelingen met poorten tot aan de werking van een processor. Van elke schakeling of systeem kan de werking worden gesimuleerd. Hierbij wordt het gedrag van componenten en het verloop van signalen in de tijd op ingangen, uitgangen en relevante verbindingslijnen zichtbaar gemaakt. Zo wordt in detail gevisualiseerd wat het gedrag is van de hardware als er een instructie wordt uitgevoerd. Het boek is opgebouwd uit drie modules die de volgende onderwerpen behandelen: Basismodule Poorten en combinatorische schakelingen. Hoe rekent een computer? Hoe werkt een rekenmachine? Module Digitale Techniek Hoe ontwerp je combinatorische schakelingen m.b.v. Boole-algebra? Sequentiële schakelingen en het ontwerpen van ‘Finite State Systems’. Complexe schakelingen als decoders, multiplexers, asynchrone en synchrone tellers. Module Computerarchitectuur Hoe werkt een ‘loopje’ precies? If-then-else, while en for loops. De Harvard-architectuur. Hoe verloopt de communicatie tussen de aanroeper en de aangeroepene bij aanroep van een procedure? Bij de module Computerarchitectuur worden programma’s in de taal assembler geschreven. Hierbij wordt gebruik gemaakt van een instructieset van slechts 15 instructies. Website Het boek wordt ondersteund door de website: www.science.uva.nl/amstel/SIM-PL. De SIM-PL software en de componenten die nodig zijn voor de simulaties kunnen hiervandaan worden gedownload. Ook staan hier antwoorden op vragen en vraagstukken. Verder zijn op deze site collegesheets voor docenten en voorbeelden van tentamens beschikbaar. Doelgroepen VAN 0 EN 1 TOT PROCESSOR is geschreven voor iedereen die geïnteresseerd is in de basisprincipes waarop de werking van computers berust. Het boek is zeer geschikt voor studenten Informatica, Technische Informatica en E-technology in het hoger onderwijs en het MBO. Het boek kan worden ingezet bij vakken als Digitale Techniek, Embedded Systems en Architectuur & Computerorganisatie. Delen van de eerste drie hoofdstukken zijn opgenomen in modules voor de vakken Informatica, NLT en Wiskunde D in het voortgezet onderwijs. Ben Bruidegom is werkzaam bij het AMSTEL-Instituut van de Universiteit van Amsterdam als ontwikkelaar van educatieve hard- en software en docent aan het College of Science van deze universiteit. Hij heeft tientallen jaren ervaring op het gebied van de technische automatisering en het ontwikkelen van onderwijs hiervoor.

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A Hands-on Guide to Crafting Your Own Power Plant The book you are about to read provides a step-by-step guide for building a renewable energy power plant at home. Our goal was to make the book as practical as possible. The material is intended for immediate application with a small amount of theory. Yet, the theory is important as a foundation that saves time and effort by disabusing the readers of potential misconceptions. Specifically, upon having a firm understanding of photovoltaic physics, you will not be inclined to fruitlessly search for 90% efficient solar panels! We want our readers to be the “doers”. If the book gets covered in grime and some pages become torn while you are building your power plant – this is the best compliment to us. The book covers solar and wind energy. Also, a curious power source based on manure is discussed as well, giving the doers an opportunity to further develop the manure fuel cell. It is important to note that there are many companies offering installation of complete solar solutions. Upon installing the panels, the system is not owned by the customer. Therefore, there is no freedom for experimentation and optimization. Also, none can beat the cost of a DIY solution as well as the ultimate satisfaction. All that is written here is a result of us building a renewable energy solution in Southern California. As the book was completed, the energy began flowing!

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The OWON VDS6000 Series PC Oscilloscope combines powerful performance with a sleek, ultra-thin design. With 100 MHz bandwidth, 1 GSa/s real-time sampling, and up to 14-bit resolution, it delivers highly accurate measurements. The built-in 5 MHz function generator, USB-C power supply, and optional WiFi connectivity make it incredibly versatile. Compatible with Windows, Linux, Android, and iOS, the VDS6000 is perfect for labs, fieldwork, and remote diagnostics – compact, flexible, and ready for any challenge. Features Bandwidth: 100 MHz Vertical resolution: 14 bits Rise time: ≤3.5 ns Memory: 10 Mpts Number of channels: 2 channels + 1 channel function generator Horizontal scale: 5ns - 100s/div Sample rate: Max. 1 GSa/s Maximum voltage: 40 V (peak - peak) Automatic measurements: Vpp, Vavg, Vamp, Vrms, Freq, Period, Vmax, Vmin, Vtop, Vbase, Overshoot, Preshoot, Rise Time, Connectivity: USB-C, LAN, Wifi (optional) Fall Time, Delay A→B↑, Delay A→B↓, +Width, -Width, +Duty, -Duty Bandwidth: 5 MHz Sample rate: 25 MSa/s Standard waveforms: Sine (0.1 Hz - 5 MHz), Square (0.1 Hz - 200 kHz), Ramp (1 Hz - 10 kHz), Pulse (1 Hz - 10 kHz) Resolution: 10 bits DC offset range (AC + DC): ±2.5 V Amplitude range: 10 mVpp - 5 Vpp Dimensions: 190 x 120 x 18 mm Weight: 380 g Downloads Manual Quick Guide PC Software MacOS Software

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This book is for people who want to understand how AC drives (also known as inverter drives) work and how they are used in industry by showing mainly the practical design and application of drives. The key principles of power electronics are described and presented in a simple way, as are the basics of both DC and AC motors. The different parts of an AC drive are explained, together with the theoretical background and the practical design issues such as cooling and protection. An important part of the book gives details of the features and functions often found in AC drives and gives practical advice on how and where to use these. Also described is future drive technology, including a matrix inverter. The mathematics is kept to an essential minimum. Some basic understanding of mechanical and electrical theory is presumed, and a basic knowledge of single andthree phase AC systems would be useful. Anyone who uses or installs drives, or is just interested in how these powerful electronic products operate and control modern industry, will find this book fascinating and informative.

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VB Express 2010 (DE) | E-book

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The OWON ADS900A series is a compact 12-bit digital oscilloscope offering up to 2 GSa/s, 100 Mpts memory, and 125/250 MHz bandwidth. With its 7" multi-touch display, FFT, protocol decoding, and integrated logic analyzer, it delivers precise signal analysis for lab, workshop, and field applications. Specifications ADS914A ADS924A Bandwidth (-3 dB) 125 MHz 250 MHz Channels 4 Max. sample rate 2 GSa/s (single-channel) 1 GSa/s (dual-channel) 500 MSa/s (full-channel) DC Gain Accuracy 3% (≤1 mV) 2% (≥2 mV) Max memory depth 100M Vertical resolution 12 bits Relay time accuracy ±25 ppm (typical) Input Impedance 1 MΩ±2%, parallel with20 pF±5 pF Probe Attenuation Coefficient 1.00μX-1M.00X,step by 1-2-5, support custom Trigger type Edge, Video, Pulse, Slope, Runt, Windows, Timeout, Nth, Logic, RS232/UART, I²C, SPI CAN, LIN Bus decoding RS232/UART, I²C, SPI, CAN, LIN Auto measurement Period, Frequency, +Width, -Width, Rise Time, Fall Time, Scr Duty, +Duty,-Duty, Vavg, Vpp, VRMS, Overshoot, Vmax, Vmin, Vtop, CycRms, Vbase, Vamp, Preshoot, Std Dev, +Pulse Cnt, -Pulse Cnt, Rise Cnt, Fall Cnt, Area, Cyc Area, Delay(A↑-B↑), Delay(A↑-B↓), Delay(A↓-B↑), Delay(A↓-B↓), Phase(A↑-B↑) Phase(A↑-B↓), Phase(A↓-B↑), Phase(A↓-B↓), FRR(A↑-B↑), FRF(A↑-B↓) FFR(A↓-B↑), FFF(A↓-B↓), LRR(A↑-B↑), LRF(A↑-B↓), LFR(A↓-B↑), LFF(A↓-B↓) Waveform Math +, -, *, /, &&, ||, ^, ！, Intg, Diff, Sqrt, Function operation (Lg / Ln / Exp / Abs / Sine / Cosine / Tan), FFT, FFT rms, User Defined, digital filter (low pass, high pass, band pass, band reject) Frequency counter 6-digit frequency counter Maximum frequency: maximum analog bandwidth of oscilloscope Voltmeter Support DC, AC+DCrms, ACrms, Resolution: 4 digits (ACV/DCV) Logical Analyzer Specifications Number of channels 16 input channels (D0-D15) (D0 to D7, D8 to D15) Max. input voltage ±40V peak CAT I, transient overvoltage 800Vpk Input Impedance 100kΩ, 8 pF Vertical resolution 1 bit Other Communication Interface HDMI, USB device, USB Host, Trig Out (P/F), LAN Display 7 inch (1024x600), capacitive multi-touch screen Power supply interface USB-C Dimensions 260 x 160 x 78 mm Weight 1.5 kg Included 1x OWON ADS924A Oscilloscope 1x Power Adapter 1x Power Cord 1x USB Cable 1x Probe 1x Quick Guide Downloads Manual Quick Guide PC Software

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Specifications Bandwidth: 50 MHz Analog Channels: 4 Real-time sample rate up to 1 GS/s Memory depth up to 24 Mpts Up to 30,000 wfms/s waveform capture rate Up to 60,000 frames hardware real-time waveform recording and playback functions Innovative 'UltraVision' technology Various trigger and bus decoding functions Low noise floor, vertical scale range: 1 mV/div to 10 V/div Various interfaces: USB Host&Device, LAN (LXI), AUX Compact size, light weight, easy to use 7 inch WVGA (800x480) TFT LCD, intensity graded color display Included 1x Rigol DS1054Z Oscilloscope 1x Power cord 1x USB cable 4x PVP2150 Passive oscilloscope probe (150 MHz)

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The uArm Swift Pro is a high quality robotic arm that can be used in a wide range of applications. The uArm Swift Pro was developed and optimized for use in education, which means that many packages are already available for open source platforms such as ROS. The uArm Swift Pro has a position repeatability of 0.2 mm and is also equipped with a stepper motor and a 12-bit encoder. These are just a few reasons that make the uArm Swift Pro an excellent choice for educational use. Another great feature is the 3D printing kit that converts the uArm Swift Pro into a 3D printer in less than 1 minute. The uArm supports the following development platforms/systems: UFACTORY SDK Arduino Python ROS GRABCAD OpenMV Smartphone App The smartphone app for iOS is already available in the App Store and enables easy control and monitoring of the robotic arm. The app for Android is in development and will be available soon. An example of the Machine Vision The following GIF shows the uArm in combination with the OpenMV Machine Vision Cam M7 and the facial recognition applications that can be implemented in MicroPython. Specifications Degrees of Freedom: 4 Repeatability: Up to 0.2 mm Payload: 500 g Working Range: 50-320 mm Positioning Speed: 100 m/s Position Feedback: 12-bit Encoder Dimensions: 150 x 140 x 281mm Weight: 2.2 kg Included UFactory uArm Swift Pro Body Bluetooth & Vacuum Gripper Downloads Datasheet

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FLUX Ador is the world's first color printing laser cutter. Powered by three high-quality, interchangeable modules, Ador enables you to engrave and cut though a wide range of materials while enhancing your projects with a pop of color. New creative potential with Ador Whether you’re an educator, small business, crafter or designer, with Ador, the application boundary is for you to define. Easy to use Place material then autofocus Drag and drop your design Engrave, cut or print Project Completed! Big workspace, big ideas Ador offers a big working space of 430 x 300 mm, with a depth of 30 mm, expanding the horizons of your creativity. Specifications Dimensions 637 x 488 x 226 mm Weight 19 kg Work Area X&Y: 20 W Diode laser: 430 x 300 mm (X & Y varies with different modules)Z: 30 mm (for all modules) & 20 mm (with prism) Camera Preview Area Whole work area Voltage AC 110-240 V Touch Panel Yes, 8 inches (diagonal) Camera 8 MP I/O USB / WiFi Laser Spec W Diode laser Module Laser Moving Speed 0~400 mm/s Laser Cutting Thickness Varies for different materials Software Mode Vector / Graphic (monochrome, gray scale) Operating System Windows / macOS / Linux Software File Type JPG / PNG / SVG / DXF Included FLUX Ador 20 W diode laser module 6x prism lift Power adapter Power cord Hex key Vent Hose Vent hose Duct Clamp Wooden test piece Laser Cutter Lubricant Downloads Firmware

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The UDP3305S-E is a high-performance programmable linear DC power supply. It has a clear LCD user interface, excellent performance indicators, a variety of analysis functions and communication interfaces. It can meet the diversified test needs of users. It aims to provide cost-effective DC programmable power supply equipment for teaching, scientific research, industry and other fields. LCD interactive interface Using a 4.3-inch high-definition display screen, it provides users with a man-machine interface with rich functions and simple operation, which can display the current set output voltage/current, actual output voltage/current and protection output voltage/current value of the power supply in real time. The functional interface is simple and comprehensive, easy to operate. One-key setting for series and parallel The series-parallel connection between CH1 and CH2 of the main channel can be realized without external connection, which simplifies the connection and makes the test easier. List/Delayer function With list and delay setting functions, it can set up to 2048 sets of data according to test requirements, and the number of cycles can reach 99999. It is used with waveform templates, which is very convenient for cycle testing and aging testing. Rich remote control interface Standard RS232 communication interface, Ethernet interface, Digital I/O and master and slave USB interfaces, can be controlled by remote connection to Ethernet, or through RS232 and USB, with the host computer software to achieve software control. Specifications Type Linear DC power supply Channels 4 Total power 328 W Output voltage CH1/CH2: 0~30 VCH3: 0~6 VCH4: 5 V Output current CH1/CH2: 0~5 ACH3: 0~3 ACH4: 2 A Resolution 10 mV, 1 mA Setting accuracy 0.3% +20 mV<0.2% +5 mA Connectivity USB Device, RS-232, LAN, USB host, Digital I/O Included 1x UDP3305S-E DC Power Supply 1x Power cord 1x USB cable Downloads Datasheet User manual Programming manual Software V1.0 Firmware V1.10

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Learn programming for Alexa devices, extend it to smart home devices and control the Raspberry Pi The book is split into two parts: the first part covers creating Alexa skills and the second part, designing Internet of Things and Smart Home devices using a Raspberry Pi. The first chapters describe the process of Alexa communication, opening an Amazon account and creating a skill for free. The operation of an Alexa skill and terminology such as utterances, intents, slots, and conversations are explained. Debugging your code, saving user data between sessions, S3 data storage and Dynamo DB database are discussed. In-skill purchasing, enabling users to buy items for your skill as well as certification and publication is outlined. Creating skills using AWS Lambda and ASK CLI is covered, along with the Visual Studio code editor and local debugging. Also covered is the process of designing skills for visual displays and interactive touch designs using Alexa Presentation Language. The second half of the book starts by creating a Raspberry Pi IoT 'thing' to control a robot from your Alexa device. This covers security issues and methods of sending and receiving MQTT messages between an Alexa device and the Raspberry Pi. Creating a smart home device is described including forming a security profile, linking with Amazon, and writing a Lambda function that gets triggered by an Alexa skill. Device discovery and on/off control is demonstrated. Next, readers discover how to control a smart home Raspberry Pi display from an Alexa skill using Simple Queue Service (SQS) messaging to switch the display on and off or change the color. A node-RED design is discussed from the basic user interface right up to configuring MQTT nodes. MQTT messages sent from a user are displayed on a Raspberry Pi. A chapter discusses sending a proactive notification such as a weather alert from a Raspberry Pi to an Alexa device. The book concludes by explaining how to create Raspberry Pi as a stand-alone Alexa device.

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