Books | Audio & RF

8 producten


  •  -14% Practical Audio DSP Projects with the ESP32

    Practical Audio DSP Projects with the ESP32

    Easy and Affordable Digital Signal Processing The aim of this book is to teach the basic principles of Digital Signal Processing (DSP) and to introduce it from a practical point of view using the bare minimum of mathematics. Only the basic level of discrete-time systems theory is given, sufficient to implement DSP applications in real time. The practical implementations are described in real time using the highly popular ESP32 DevKitC microcontroller development board. With the low cost and extremely popular ESP32 microcontroller, you should be able to design elementary DSP projects with sampling frequencies within the audio range. All programming is done using the popular Arduino IDE in conjunction with the C language compiler. After laying a solid foundation of DSP theory and pertinent discussions on the main DSP software tools on the market, the book presents the following audio-based sound and DSP projects: Using an I²S-based digital microphone to capture audio sound Using an I²S-based class-D audio amplifier and speaker Playing MP3 music stored on an SD card through an I²S-based amplifier and speaker Playing MP3 music files stored in ESP32 flash memory through an I²S-based amplifier and speaker Mono and stereo Internet radio with I²S-based amplifiers and speakers Text-to-speech output with an I²S-based amplifier and speaker Using the volume control in I²S-based amplifier and speaker systems A speaking event counter with an I²S-based amplifier and speaker An adjustable sinewave generator with I²S-based amplifier and speaker Using the Pmod I²S2 24-bit fast ADC/DAC module Digital low-pass and band-pass real-time FIR filter design with external and internal A/D and D/A conversion Digital low-pass and band-pass real-time IIR filter design with external and internal A/D and D/A conversion Fast Fourier Transforms (FFT)

    € 34,95€ 29,95

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  •  -57% The State of Hollow State Audio

    The State of Hollow State Audio

    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.

    € 34,95€ 14,95

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  • Electric Guitar (2nd Edition)

    Electric Guitar (2nd Edition)

    Sound Secrets and TechnologyWhat would today’s rock and pop music be without electric lead and bass guitars? These instruments have been setting the tone for more than sixty years. Their underlying sound is determined largely by their electrical components. But, how do they actually work? Almost no one is able to explain this to the true musician with no technical background. This book answers many questions simply, in an easily-understandable manner.For the interested musician (and others), this book unveils, in a simple and well-grounded way, what have, until now, been regarded as manufacturer secrets. The examination explores deep within the guitar, including pickups and electrical environment, so that guitar electronics are no longer considered highly secret. With a few deft interventions, many instruments can be rendered more versatile and made to sound a lot better – in the most cost-effective manner.The author is an experienced electronics professional and active musician. He has thoroughly tested everything described here, in practice.

    € 34,95

    Leden € 31,46

  • SDR Hands-on Boek

    SDR Hands-on Boek

    De kortegolftechniek heeft een bijzondere aantrekkingskracht: Hij kan gemakkelijk grote afstanden overbruggen. Door kortegolfsignalen te weerkaatsen tegen de geleidende lagen van de ionosfeer, kunnen ze worden ontvangen op plaatsen voorbij de horizon en kunnen ze dus overal op aarde komen. Hoewel de technologie naar steeds hogere frequenties streeft en radio meestal op FM, DAB+, satelliet of internet wordt beluisterd, vereisen moderne transmissiewijzen een uitgebreide infrastructuur en zijn zij uiterst kwetsbaar. In geval van een wereldwijde stroomstoring is er niets belangrijker dan de kortegolf. Amateur radio is niet alleen een hobby, het is ook een noodradiosysteem! Elektor's SDR-Shield (SKU 18515) is een veelzijdige kortegolf ontvanger tot 30 MHz. Met behulp van een Arduino en de juiste software kunnen radiostations, morse signalen, SSB stations, en digitale signalen worden ontvangen.In dit boek beschrijft de succesvolle auteur en enthousiaste radioamateur Burkhard Kainka de moderne praktijk van software defined radio met behulp van het Elektor SDR Shield. Hij geeft niet alleen een theoretische achtergrond, maar legt ook tal van open source software tools uit.

    € 29,95

    Leden € 26,96

  •  -48% Acoustics in Performance

    Acoustics in Performance

    All you need to know about good acoustics and sound systems in performance and worship spaces!Everyone knows that the ability to hear music in balance and to understand speech is essential in any space used for performance or worship. Unfortunately, in the early 21st century, we find that buildings with good acoustics are the exception rather than the rule. Much of the fault leading to this result can be traced to the widespread perception that acoustics is a black art. In fact, scientific acoustics as developed in the last century is a well-defined engineering practice that can lead to predictable excellent results.A basic, non-engineering understanding of acoustics will help building owners, theater managers, ministers and teachers of music, performers, and other professionals to achieve their goals of excellent acoustics in venues with which they work. Performers having a basic understanding of acoustics will be able to make the most of the acoustics of the venue in which they perform.This book helps those responsible for providing good acoustics in performance and worship spaces to understand the variables and choices entailed in proper acoustic design for performance and worship. Practicing acoustical consultants will find the book a useful reference as well. The level of presentation is comfortable and straightforward without being simplistic. If correct acoustical principles are incorporated into the design, renovation, and maintenance of performance and worship venues, good acoustics will be the result.

    € 24,95€ 12,95

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  • Designing Audio Power Amplifiers (2nd Edition)

    Designing Audio Power Amplifiers (2nd Edition)

    This comprehensive book on audio power amplifier design will appeal to members of the professional audio engineering community as well as the student and enthusiast. Designing Audio Power Amplifiers begins with power amplifier design basics that a novice can understand and moves all the way through to in-depth design techniques for very sophisticated audiophiles and professional audio power amplifiers. This book is the single best source of knowledge for anyone who wishes to design audio power amplifiers. It also provides a detailed introduction to nearly all aspects of analog circuit design, making it an effective educational text. Develop and hone your audio amplifier design skills with in-depth coverage of these and other topics: Basic and advanced audio power amplifier design Low-noise amplifier design Static and dynamic crossover distortion demystified Understanding negative feedback and the controversy surrounding it Advanced NFB compensation techniques, including TPC and TMC Sophisticated DC servo design MOSFET power amplifiers and error correction Audio measurements and instrumentation Overlooked sources of distortion SPICE simulation for audio amplifiers, including a tutorial on LTspice SPICE transistor modeling, including the VDMOS model for power MOSFETs Thermal design and the use of ThermalTrak transistors Four chapters on class D amplifiers, including measurement techniques Professional power amplifiers Switch-mode power supplies (SMPS)

    € 92,50

    Leden € 83,25

  • The Bottle Builder – Volume 1 (E-book)

    Elektor Digital The Bottle Builder Volume 1 (E-book)

    The author, Johan Basse Bergqvist, is an engineer, a musician, and an audiophile with a knack for building projects that produce the desired results. The combination of these skills leads to a uniquely valuable perspective on audio design that is routinely reflected in the book and passed on to the readers. Several design projects are provided, 40 in total. The designs are explained, and the unique features or methods he uses are described in further detail. Each design includes detailed schematics and a complete parts list. Many of the projects also include layout documentation in the form of CAD photos of the PCB layouts. The range of projects is very diverse and includes something that will appeal to everyone. Stereo amplifiers, guitar and bass amplifiers, preamplifiers for phono, and microphones are all covered. Several variants for each type are included, and the power amplifier designs range from a few watts to several hundred watts, which meet almost any power level you might tackle.

    € 59,95

    Leden € 47,96

  • Modern High-End Valve Amplifiers (E-BOOK)

    Elektor Digital Modern High-End Valve Amplifiers (E-BOOK)

    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 e-book (pdf) 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 e-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 e-book a rich and useful source of information.

    € 29,95

    Leden € 23,96

<h2>Wat is RF? Waar wordt RF voor gebruikt?</h2>
<p>Elektromagnetische velden, radiogolven, microgolven, en draadloze signalen worden radiofrequente (RF) energie genoemd. RF stromen zijn elektrische stromen die oscilleren op radiofrequenties en hebben unieke kenmerken. RF energie is overal om ons heen, en RF wordt gebruikt in allerlei elektronica en apparaten, waaronder radio- en televisie-uitzendingen, mobiele telefoons, satellietcommunicatie, microgolfovens, radars, en industriële verwarming en sealers. Dit zijn maar enkele voorbeelden.</p>
<h2>Wat is software-defined radio (SDR), en wat kun je met SDR doen?</h2>
<p>In het algemeen wordt een elektrisch signaal opgewekt door hardware componenten. Het is tamelijk ingewikkeld om signalen met hardware te bewerken en het heeft beperkingen om problemen op te verhelpen. Met software-defined radio (SDR) vindt de RF communicatie plaats met behulp van software, wat de beperkingen van de signaalbewerking met hardware vereenvoudigd. In plaats van mixers, filters, versterkers, modulatoren, demodulatoren, enzovoort te moeten gebruiken, gebruikt SDR alleen een ADC en DAC, samen met antennes, zonder dat veel hardware componenten nodig zijn.</p>
<p>De software voor SDR kan op een personal computer of een embedded systeem gebruikt worden, en biedt een meer flexibele toepassing en maakt het gemakkelijk om problemen te verhelpen. SDR wordt gebruikt in omroep- en amateurradio, radioastronomie, het volgen van vliegtuigen en het bouwen van een GSM netwerk, en nog veel meer toepassingen. Het is een goede keuze voor veel leuke projecten.</p>
<p>RTL-SDR is een betaalbare USB radio die gebruikt wordt om live radio uitzendingen vanaf een computer te ontvangen. Door zijn populariteit profiteren gebruikers van een grotere verscheidenheid aan radiosignalen die nog maar een paar jaar geleden honderden of duizenden euro's zouden hebben gekost.</p>
<h2>Wat heeft Elektor te bieden?</h2>
<p>Elektor biedt een verscheidenheid aan RF- en SDR-gerelateerde kits, zoals de <a href="https://www.elektor.nl/elektor-raspberry-pi-rtl-sdr-kit">Elektor Raspberry Pi RTL-SDR Kit</a>, waarmee je radiosignalen tussen 500&nbsp;kHz en 1,75&nbsp;GHz kunt ontvangen van stations die gebruik maken van verschillende banden, waaronder MW/SW/LW omroep, ISM, CB, ham radio, utility, en meer. Bovendien levert Elektor zijn klanten <a href="https://www.elektor.nl/catalogsearch/result/?q=telescopic%20antenna">telescopische antennes</a> en magnetisch te monteren antennes, en nog veel meer. Blader door onze lijst om een passende oplossing voor je te vinden.</p>
<h2>Wat brengt de toekomst voor SDR?</h2>
<p>De populariteit van SDR oplossingen neemt toe sinds de wijdverspreide beschikbaarheid van 4G&nbsp;apparatuur. De vooruitzichten van komende technologieën als&nbsp;5G, het <a href="https://www.elektor.nl/platforms/iot-lora">Internet of Things (IoT)</a>, en sensornetwerken beloven SDR nog meer te stimuleren. SDR's worden gemaakt met krachtigere FPGA's, en deze toepassingen zijn bedoeld voor steeds complexere taken. Als gevolg daarvan zullen de FPGA tools die groeiende hoeveelheden gegevens en complexiteit kunnen beheren onvermijdelijk aan populariteit winnen.</p>

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