"This second edition of Small Signal Audio Design is the essential and unique guide to the design of high-quality analogue circuitry for preamplifiers, mixing consoles, and many other signal-processing devices. You will learn to use inexpensive and readily available parts to obtain state-of-the-art performance in all the vital parameters of noise, distortion, crosstalk, etc. This practical handbook provides a repertoire of circuit blocks from which almost any type of audio system can be built. Essential points of theory that determine practical performance are lucidly and thoroughly explained, with the mathematics at a minimum. Virtually every page reveals nuggets of specialized knowledge not found elsewhere. Douglas' background in design for manufacture ensures he keeps a wary eye on the cost of things. Learn how to: - Make amplifiers with apparently impossibly low noise - Design discrete circuitry that can handle enormous signals with vanishingly low distortion - Use ordinary bipolar transistors to make amplifiers with an input impedance of more than 50 Megohms - Transform the performance of low-cost-opamps, and how to make filters with very low noise and distortion - Make incredibly accurate volume controls - Make a huge variety of audio equalisers - Make magnetic cartridge preamplifiers that have noise so low it is limited by basic physics - Sum, switch, clip, compress, and route audio signals effectively - Build reliable power-supplies, with many practical ways to keep both the noise and the cost down"--
The Design of Active Crossovers is a unique guide to the design of high-quality circuitry for splitting audio frequencies into separate bands and directing them to different loudspeaker drive units specifically designed for handling their own range of frequencies. Traditionally this has been done by using passive crossover units built into the loudspeaker boxes; this is the simplest solution, but it is also a bundle of compromises. The high cost of passive crossover components, and the power losses in them, means that passive crossovers have to use relatively few parts. This limits how well the crossover can do its basic job. Active crossovers, sometimes called electronic crossovers, tackle the problem in a much more sophisticated manner. The division of the audio into bands is performed at low signal levels, before the power amplifiers, where it can be done with much greater precision. Very sophisticated filtering and response-shaping networks can be built at comparatively low cost. Time-delay networks that compensate for phyical misalignments in speaker construction can be implemented easily; the equivalent in a passive crossover is impractical because of the large cost and the heavy signal losses. Active crossover technology is also directly applicable to other band-splitting signal-processing devices such as multi-band compressors. The use of active crossovers is increasing. They are used by almost every sound reinforcement system, by almost every recording studio monitoring set-up, and to a small but growing extent in domestic hifi. There is a growing acceptance in the hifi industry that multi-amplification using active crossovers is the obvious next step (and possibly the last big one) to getting the best possible sound. There is also a large usage of active crossovers in car audio, with the emphasis on routing the bass to enormous low-frequency loudspeakers. One of the very few drawbacks to using the active crossover approach is that it requires more power amplifiers; these have often been built into the loudspeaker, along with the crossover, and this deprives the customer of the chance to choose their own amplifier, leading to resistance to the whole active crossover philosophy. A comprehensive proposal for solving this problem is an important part of this book. The design of active crossovers is closely linked with that of the loudspeakers they drive. A chapter gives a concise but complete account of all the loudspeaker design issues that affect the associated active crossover. This book is packed full of valuable information, with virtually every page revealing nuggets of specialized knowledge never before published. Essential points of theory bearing on practical performance are lucidly and thoroughly explained, with the mathematics kept to an essential minimum. Douglas' background in design for manufacture ensures he keeps a wary eye on the cost of things. Features: Crossover basics and requirements The many different crossover types and how they work Design almost any kind of active filter with minimal mathematics Make crossover filters with very low noise and distortion Make high-performance time-delay filters that give a constant delay over a wide range of frequency Make a wide variety of audio equaliser stages: shelving, peaking and notch characteristics All about active crossover system design for optimal noise and dynamic range There is a large amount of new material that has never been published before. A few examples: using capacitance multipliers in biquad equalisers, opamp output biasing to reduce distortion, the design of NTMTM notch crossovers, the design of special filters for filler-driver crossovers, the use of mixed capacitors to reduce filter distortion, differentially elevated internal levels to reduce noise, and so on. Douglas wears his learning lightly, and this book features the engaging prose style familiar from his other books The Audio Power Amplifier Design Handbook, Self on Audio, and the recent Small Signal Audio Design.
This book is essential for audio power amplifier designers and engineers for one simple reason...it enables you as a professional to develop reliable, high-performance circuits. The Author Douglas Self covers the major issues of distortion and linearity, power supplies, overload, DC-protection and reactive loading. He also tackles unusual forms of compensation and distortion produced by capacitors and fuses. This completely updated fifth edition includes four NEW chapters including one on The XD Principle, invented by the author, and used by Cambridge Audio. Crosstalk, power amplifier input systems, and microcontrollers in amplifiers are also now discussed in this fifth edition, making this book a must-have for audio power amplifier professionals and audiophiles.
Douglas Self has called upon his years of experience at the cutting edge of audio design to compile this handbook for professionals and students. The book provides a clear and practical guide to the state of the art, and includes detailed design and construction information. This new edition is more comprehensive than ever, with a new chapter on Class G amplifiers and further new material on output coils, thermal distortion, relay distortion, ground loops, triple EF output stages and convection cooling. Douglas Self has dedicated himself to demystifying amplifier design and establishing empirical design techniques based on electronic design principles and experimental data. His rigorous and thoroughly practical approach has established him as a leading authority on amplifier design, especially through the pages of Electronics World where he is a regular contributor. * Discover the secrets of cutting-edge audio design * The definitive professional handbook for amplifier designers * Includes a new chapter on Class G amplifiers
Linear Audio Vol 0 is our first printed bookzine dedicated to technical audio and perception. This first issue has more than 12 insightful articles by an international team of authors: Solid State: Nelson Pass comes up with a tribute to the single ended triode power amp by replacing hollow state with silicon carbide in The Arch Nemesis*, while Douglas Self cuts through the confusion and handwringing by showing how Inclusive Compensation can be successfully applied. Joachim Gerhard goes Down the Rabbit Hole to get the lowest MC-preamp noise this side of liquid helium cooling*. Tube technology: Air Polisois extends his DC-coupling and Common Transformer developments in the deceptively simple Mini-Simplex, while Stuart Yaniger gives you the definite deal on The Truth about the Humble Cathodyne. Meanwhile, Frank Blohbaum shows you A New Low-Noise Circuit Approach for Pentodes with his BestPenthode circuits. Loudspeakers and perception: Jean-Claude Gaertner embarked on a wide-ranging project for an active 4-way, DSP driven, remotely controlled system Project21. The first part describes the satellites. Siegfried Linkwitz contributes his landmark paper on STEREO - From live to recorded and reproduced - What does it take? - this should be the basis for many a discussion of what is and what is not possibly in stereo, and why. Test Equipment: Bob Cordell developed his Distortion Magnifier, a simple add-on to any distortion measurement setup increasing the resolution by 20 or even 40dB*. Book reviews: Andy Bryner reviews Douglas Self's latest opus Small Signal Audio Design and likes what he reads, while Bob Cordell's Audio Power Amplifier Design is waiting in the wings to be revealed. Tips & Tricks: If, like Ed Simon, you have more ic's and transistor types than you can keep track off, you'll love his IC holder notebook. Musings: Rene Wouda asks "Do you remember your first single?" . A bit tongue-in-cheek but thoughtful nevertheless.
Diabolically funny and subversively philosophical, Italian novelist Giacomo Sartori’s I Am God is the diary of the Almighty’s existential crisis that erupts when he falls in love with a human. I am God. Have been forever, will be forever. Forever, mind you, with the razor-sharp glint of a diamond, and without any counterpart in the languages of men. So begins God’s diary of the existential crisis that ensues when, inexplicably, he falls in love with a human. And not just any human, but a geneticist and fanatical atheist who’s certain she can improve upon the magnificent creation she doesn’t even give him the credit for. It’s frustrating, for a god. God has infinitely bigger things to occupy his celestial attentions. Yet he can’t tear his eyes (so to speak) from the geneticist who’s unsettlingly avid when it comes to science, sex, and Sicilian cannoli. Whatever happens, he must safeguard his transcendental dignity. So he watches—disinterestedly, of course—as the handsome climatologist who has his sights set on her keeps having strange accidents. And as the lanky geneticist becomes hell-bent on infiltrating the Vatican’s secret files, for reasons of her own…. A sly critique of the hypocrisy and hubris that underlie faith in religion, science, and macho careerism, I Am God takes us on a hilarious and provocative romp through the Big Questions with the universe’s supreme storyteller.
"بعد أن قلب هاري الظرف، ويداه ترتعدان، رأى هاري ختمًا شمعيًا أرجوانيًا يحمل شعار النبالة؛ أسدًا، ونسرًا، وفرو الغرير وثعبانًا يُحيط بالحرف "H"." لم يسمع هاري بهوجورتس من قبل على الإطلاق عندما بدأت الخطابات بالتساقط على ممسحة الباب على الرقم الرابع في شارع برايفت درايف. وكانت مغلّفة باللون الأخضر على مخطوطة ورقية صفراء مع ختم أرجواني، واستولى عليها عمه وعمته المخيفان بصورة سريعة. بعد ذلك، في عيد ميلاد هاري الحادي عشر، اقتحم رجل عملاق ذو عيون بارزة يُدعى روبياس هاغريد المكان حاملًا بعض الأخبار المذهلة: هاري بوتر أصبح ساحرًا، وتم قبوله في مدرسة هوجورتس لفنون السحر والشعوذة. مغامرة رائعة على وشك البدء!
This book describes the design of CMOS circuits for ultra-low power consumption including analog, radio frequency (RF), and digital signal processing circuits (DSP). The book addresses issues from circuit and system design to production design, and applies the ultra-low power circuits described to systems for digital hearing aids and capsule endoscope devices. Provides a valuable introduction to ultra-low power circuit design, aimed at practicing design engineers; Describes all key building blocks of ultra-low power circuits, from a systems perspective; Applies circuits and systems described to real product examples such as hearing aids and capsule endoscopes.
This book focuses on the design of a 3rd Order CT-ΣΔM where the integrator stages of the filter are implemented with Bipolar-Junction Transistors (BJT) differential pairs. These circuits are fully analyzed and the design method is carefully explained. The design method is validated through experimental measurements of several prototype circuits.