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Jan Didden created Linear Audio in 2010 and published 14 Volumes between 2010 and 2017. Each 200-page Volume contains on average 10 articles by expert authors in the field of audio, acoustics, and instrumentation. Whether you are interested in tube amplifiers, solid-state equipment, loudspeaker design, capacitor and resistor distortion or distortion measurement, you are certain to find helpful advice and interesting discussions. From beginner to advanced level, for the audio professional or the serious hobbyist, this ExpertCollection will advance your understanding and offer new perspectives on common issues. Bonus material included with this collection is a 5-part YouTube series on negative feedback as applied to audio by renowned author Jan Didden, and nine additional landmark audio articles and presentations. If you are seriously interested in audio, acoustics, and instrumentation, you can’t afford to miss this! The published material is indexed and fully searchable and will provide an almost limitless resource for many years to come. You can read about Linear Audio’s authors, and the Table of Contents of each Volume, at linearaudio.net.

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The SparkFun RP2350 Pro Micro provides a powerful development platform, built around the RP2350 microcontroller. This board uses the updated Pro Micro form factor. It includes a USB-C connector, Qwiic connector, WS2812B addressable RGB LED, Boot and Reset buttons, resettable PTC fuse, and PTH and castellated solder pads. The RP2350 is a unique dual-core microcontroller with two ARM Cortex-M33 processors and two Hazard3 RISC-V processors, all running at up to 150 MHz! Now, this doesn't mean the RP2350 is a quad-core microcontroller. Instead, users can select which two processors to run on boot instead. You can run two processors of the same type or one of each. The RP2350 also features 520 kB SRAM in ten banks, a host of peripherals including two UARTs, two SPI and two I²C controllers, and a USB 1.1 controller for host and device support. The Pro Micro also includes two expanded memory options: 16 MB of external Flash and 8 MB PSRAM connected to the RP2350's QSPI controller. The RP2350 Pro Micro works with C/C++ using the Pico SDK, MicroPython, and Arduino development environments. Features RP2350 Microcontroller 8 MB PSRAM 16 MB Flash Supply Voltage USB: 5 V RAW: 5.3 V (max.) Pro Micro Pinout 2x UART 1x SPI 10x GPIO (4 used for UART1 and UART0) 4x Analog USB-C Connector USB 1.1 Host/Device Support Qwiic Connector Buttons Reset Boot LEDs WS2812 Addressable RGB LED Red Power LED Dimensions: 33 x 17.8 mm Downloads Schematic Eagle Files Board Dimensions Hookup Guide RP2350 MicroPython Firmware (Beta 04) SparkFun Pico SDK Library Arduino Pico Arduino Core Datasheet (RP2350) Datasheet (APS6404L PSRAM) RP2350 Product Brief Raspberry Pi RP2350 Microcontroller Documentation Qwiic Info Page GitHub Repository

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Resonances From Aether Days A Pictorial and Technical Analysis from WWII to the Internet Age From the birth of radio to the late 1980s, much of real life unfolded through shortwave communication. World War II demonstrated—beyond a shadow of a doubt—that effective communications equipment was a vital prerequisite for military success. In the postwar years, shortwave became the backbone on which many of the world's most critical services depended every day. All the radio equipment—through whose cathodes, grids, plates, and transistors so much of human history has flowed—is an exceptional subject of study and enjoyment for those of us who are passionate about vintage electronics. In this book, which begins in the aftermath of World War II, you’ll find a rich collection of information: descriptions, tips, technical notes, photos, and schematics that will be valuable for anyone interested in restoring—or simply learning about—these extraordinary witnesses to one of the most remarkable eras in technological history. My hope is that these pages will help preserve this vast treasure of knowledge, innovation, and history—a heritage that far transcends the purely technical.

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Raspberry Pi Pico Wireless Pack attaches to the back of your Pico and uses an ESP32 chip to let your Pico connect to 2.4 GHz wireless networks and transfer data. There's a microSD card slot for if you want to store lots of data locally as well as a RGB LED (for status updates) and a button (useful for things like enabling/disabling Wi-Fi). Great for quickly adapting an existing Pico project to have wireless functionality, Raspberry Pi Pico Wireless Pack would come in handy for sending sensor data into home automation systems or dashboards, for hosting a web page from a matchbox or for letting your Pico interact with online APIs. Features ESP32-WROOM-32E module for wireless connectivity (connected via SPI) (datasheet) 1x Tactile button RGB LED Micro-SD card slot Pre-soldered female headers for attaching your Raspberry Pi Pico Fully assembled No soldering required (as long as your Pico has header pins attached) Compatible with Raspberry Pi Pico Dimensions: approx 53 x 25 x 11 mm (L x W x H, including headers and components) C++ and MicroPython libraries

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Multilingual DIY Kit (incl. 27 RGB LEDs + Raspberry Pi Pico) Bring some engineering magic to your festive season with the Wordy LED Christmas Tree, a unique DIY electronics kit designed by Elektor. This beautifully engineered 3D Christmas tree combines eleven PCBs, a Raspberry Pi Pico, and 27 addressable RGB LEDs to illuminate Christmas greetings in seven languages: Danish, Dutch, English, French, German, Italian, and Spanish. Unlike ordinary LED trees, each word inside the tree has its own light chamber, creating a refined, softly glowing display without sound or flicker. The LEDs are fully WS2812-compatible and driven via the popular Adafruit NeoPixel library, making custom animations and color effects easy to create. Perfect for makers, tinkerers, and festive electronics fans, this kit offers both an enjoyable build and a striking, conversation-worthy decoration. The Wordy Christmas Tree is your perfect holiday maker project! Features Multilingual greetings (7 languages) milled into the front panel 3D construction from 11 interlocking PCBs Powered by Raspberry Pi Pico 27 individually addressable RGB LEDs (pre-mounted) Smooth fade-in and fade-out animations Fully programmable using the Arduino IDE A 5-V power supply (with micro-USB connector) capable of ≥1 A is recommended for maximum brightness (not included) Dimensions (H x W x D): 130 x 115 x 75 mm Included All required PCBs with LEDs and other SMD parts mounted Raspberry Pi Pico (to be soldered & programmed by the user) 3-way pin header (to be soldered by the user) 3-way pin socket (to be soldered by the user) 4x Self-adhesive dome bumpers Project Page Elektor Labs

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The SparkFun Thing Plus Matter is the first easily accessible board of its kind that combines Matter and SparkFun’s Qwiic ecosystem for agile development and prototyping of Matter-based IoT devices. The MGM240P wireless module from Silicon Labs provides secure connectivity for both 802.15.4 with Mesh communication (Thread) and Bluetooth Low Energy 5.3 protocols. The module comes ready for integration into Silicon Labs' Matter IoT protocol for home automation. What is Matter? Simply put, Matter allows for consistent operation between smart home devices and IoT platforms without an Internet connection, even from different providers. In doing so, Matter is able to communicate between major IoT ecosystems in order to create a single wireless protocol that is easy, reliable, and secure to use. The Thing Plus Matter (MGM240P) includes Qwiic and LiPo battery connectors, and multiple GPIO pins capable of complete multiplexing through software. The board also features the MCP73831 single-cell LiPo charger as well as the MAX17048 fuel gauge to charge and monitor a connected battery. Lastly, a µSD card slot for any external memory needs is integrated. The MGM240P wireless module is built around the EFR32MG24 Wireless SoC with a 32-bit ARM Cortext-M33 core processor running at 39 MHz with 1536 kb Flash memory and 256 kb RAM. The MGM240P works with common 802.15.4 wireless protocols (Matter, ZigBee, and OpenThread) as well as Bluetooth Low Energy 5.3. The MGM240P supports Silicon Labs' Secure Vault for Thread applications. Specifications MGM240P Wireless Module Built around the EFR32MG24 Wireless SoC 32-bit ARM-M33 Core Processor (@ 39 MHz) 1536 kB Flash Memory 256 kB RAM Supports Multiple 802.15.4 Wireless Protocols (ZigBee and OpenThread) Bluetooth Low Energy 5.3 Matter-ready Secure Vault Support Built-in Antenna Thing Plus Form-Factor (Feather-compatible): Dimensions: 5.8 x 2.3 cm (2.30 x 0.9') 2 Mounting Holes: 4-40 screw compatible 21 GPIO PTH Breakouts All pins have complete multiplexing capability through software SPI, I²C and UART interfaces mapped by default to labeled pins 13 GPIO (6 labeled as Analog, 7 labeled for GPIO) All function as either GPIO or Analog Built-in-Digital to Analog Converter (DAC) USB-C Connector 2-Pin JST LiPo Battery Connector for a LiPo Battery (not included) 4-Pin JST Qwiic Connector MC73831 Single-Cell LiPo Charger Configurable charge rate (500 mA Default, 100 mA Alternate) MAX17048 Single-Cell LiPo Fuel Gauge µSD Card Slot Low Power Consumption (15 µA when MGM240P is in Low Power Mode) LEDs: PWR – Red Power LED CHG – Yellow battery charging status LED STAT – Blue status LED Reset Button: Physical push-button Reset signal can be tied to A0 to enable use as a peripheral device Downloads Schematic Eagle Files Board Dimensions Hookup Guide Datasheet (MGM240P) Fritzing Part Thing+ Comparison Guide Qwiic Info Page GitHub Hardware Repo

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Build Your Own Vintage Radio Broadcaster The Elektor AM Transmitter Kit allows streaming audio to vintage AM radio receivers. Based on a Raspberry Pi Pico microcontroller module, the AM Transmitter can transmit on 32 frequencies in the AM band, from 500 kHz up to 1.6 MHz in 32 steps of approx. 35 kHz. The frequency is selected with a potentiometer and shown on a 0.96" OLED display. A pushbutton allows toggles the transmitting mode between On and Off. The range of the transmitter depends on the antenna. The onboard antenna provides a range of a few centimeters, requiring the AM Transmitter to be placed close to or inside the radio. An external loop antenna (not included) can be connected to increase the range. The Elektor AM Transmitter Kit comes as a kit of parts that you must solder to the board yourself. Features The board is compatible with a Hammond 1593N enclosure (not included).A 5 VDC power supply with micro-USB connector (e.g., an old phone charger) is needed to power the kit (not included). Current consumption is 100 mA. The Arduino software (requiring Earle Philhower’s RP2040 Boards Package) for the Elektor AM Transmitter Kit plus more information is available at the Elektor Labs page of this project. Component List Resistors R1, R4 = 100 Ω R2, R3, R8 = 10 kΩ R5, R6, R9, R10, R11 = 1 kΩ R7 = optional (not included) P1 = potentiometer 100 kΩ, linear Capacitors C1 = 22 µF 16V C2, C4 = 10 nF C3 = 150 pF Miscellaneous K1 = 4×1 pin socket K2, K3 = 3.5 mm socket Raspberry Pi Pico pushbutton, angle mount 0.96" monochrome I²C OLED display PCB 150292-1

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After power on, YDLIDAR G4 start rotating and scanning the environment around it. The scanning distance is 16 m and the device offers a scanning rate of 9,000 times per second. It makes detailed examinations of its environment and can locate the smallest of objects surrounding it. Featuring a high-precision brushless motor and encoder disc mounted on bearings, it rotates smoothly and has a service life of up to 500,000 hours of operation. The G4 is an inexpensive solution for projects that require obstacle detection, obstacle avoidance, and/or simultaneous localization and mapping (SLAM). All YDLIDAR products are ROS ready. Features 360 degree 2D range scanning Stable performance, high precision 16 m range Strong resistance to environmental light interference Brushless motor drive, stable performance FDA Laser safety standard Class I 360 degree omnidirectional scanning, 5-12 Hz adaptive scanning frequency OptoMagnetic technology Wireless data communication Scanning rate of 9000 Hz Downloads Datasheet User Manual Development Manual SDK Tool ROS

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This 233-page e-book is packed with Arduino ideas, explanations, tips, diagrams, programs, PCB layouts, and more – enough to provide days of informative, inspiring, and stimulating reading pleasure! The PDF document includes a table of contents with links to the individual projects, allowing you to easily navigate to the sections you’re most interested in. This way, you can quickly and effortlessly switch between projects and find exactly what you’re looking for.

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An illustrated chronicle of Teknology for collectors and restorers Oscilloscopes have made a major contribution to the advancement of human knowledge, not only in electronics, but in all sciences, whenever a physical quantity can be converted into a timerelated electrical signal. This book traces the history of a crucial instrument through many Tektronix products. This is the company that invented and patented most of the functions found in all oscilloscopes today. Tek is and will always be synonymous with the oscilloscope. In nearly 600 pages, with hundreds of gorgeous photos, diagrams, anecdotes, and technical data, you'll travel through the history of Tektronix in a superb collector's edition with a technical point of view. The author is not afraid to get his hands dirty restoring his own Tek equipment. The journey starts in the early 1950s. It ends in the '90s, after exploring the ins and outs of the most interesting models in the 300, 400, 500, 5000, 7000, and 11000 series, from tubes to advanced hybrid technologies. Downloads NEW: Free Supplement (136 pages, 401 MB)

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Thanks to its six sturdy slots, Breakout Garden enables the users to simply plug and play with various tiny breakout board. Just insert one or more boards into the slots in the Breakout Garden HAT and you’re ready to go. The mini breakouts feel secure enough in the edge-connector slots and are very unlikely to fall out. There are a number of useful pins along the top of Breakout Garden, which lets you connect other devices and integrate them into your project. You shouldn't be worried if you insert a board the wrong way thanks to provided reverse polarity protection. It doesn't matter which slot you use for each breakout either, because the I²C address of the breakout will be recognised by the software and it'll detect them correctly in case you move them around. Features Six sturdy edge-connector slots for Pimoroni breakouts 0.1” pitch, 5 pin connectors Broken-out pins (1 × 10 strip of male header included) Standoffs (M2.5, 10 mm height) included to hold your Breakout Garden securely Reverse polarity protection (built into breakouts) HAT format board Compatible with Raspberry Pi 3 B+, 3, 2, B+, A+, Zero, and Zero W It's suggested using the included standoffs to attache Breakout Garden to your Raspberry Pi. Software Breakout Garden doesn't require any software of its own, but each breakout you use will need a Python library. On the Breakout Garden GitHub page you'll find an automatic installer, which will install the appropriate software for a given breakout. There are also some examples that show you what else you can do with Breakout Garden.

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This book is intended for electronics enthusiasts and professionals alike, who want a much deeper understanding of the incredible technology conquests over the pre-digital decades that created video. It details evolution of analogue video electronics and technology from the first electro-mechanical television, through advancements in Cathode Ray Tubes, transistor circuits and signal processing, up to the latest analogue, colour-rich TV, entertainment devices and calibration equipment. Key technological advances that enabled monochrome video and, eventually, colour are explained. The importance, compromises and techniques of maintaining crucial backward legacy compatibilities are described. The generation, signal processing and playback of analogue video signals in numerous capture, display, recording and playback devices together with operating principles and practices are examined. Technical and, often, political merits and deficiencies of key national and international video standards are highlighted. Several formats are shown to win and ultimately to co-exist. This book begins at fairly basic levels; concepts are introduced with human physiological perceptions of light and colour explained. This leads to the subject matter of luminance and chrominance; their equations and the circuits to process. There is full, detailed analysis of waveform shapes and timings inside video equipment and relevant popular connections e.g. S-video. Several analogue video projects which you can build yourself are also included in this book; with schematics, circuit board layouts and calibration steps to help you obtain the best results. The book makes use of many colour pages where the subject matter demands it (e.g. test cards). If you really want a deeper understanding of analogue video then this book is for you!

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