All items tagged with audio electronics (36)

Input-Output Impedance Matching – Or Not

April 18, 2024 by Jan Didden

Input-Output Impedance Matching – Or Not

In analog audio, you often must connect a source to a “receiver” unit. Pre-amp to power amp, phono preamp to an active crossover, the crossover to the power amp, that sort of stuff. Each of these units has an input impedance and an output impedance spec. I often get questions like: “My power amp has 20kΩ input impedance, my preamp has 100Ω output impedance, and maximum load is specified as 10kΩ. Will that work together or will I break something?”. Jan Didden explains all about Input-Output Impedance Matching.

audioXpress May 2024 Glass Audio Special Issue Now Available

April 12, 2024 by audioXpress Staff

audioXpress May 2024 Glass Audio Special Issue Now Available

In the 2024 Glass Audio Special issue there’s Menno van der Veen’s TubeSociety TS-2022-OTL hybrid amplifier, and a Low-Feedback Triode Amplifier With Zero Output Impedance (ZOI) as DIY projects, designed by Tim Mellow and Peter Farrow. More great audio electronic articles by Rudolf Moers, Christopher Paul, and Dimitri Danyuk. Read about sustainable acoustical absorption, the Pure Acourate Sound Project, and The Neurochrome Story. And Andrew C. Russell concludes his High-Performance 60-Watt Class A Amplifier project.

When Is a Regulator a Regulator?

April 4, 2024 by Jan Didden

When Is a Regulator a Regulator?

Regulator Needed for Stable, Noise- and Ripple-Free DC Relationship. Does your nice circuit get what he needs from the power supply? Jan Didden explores when a regulator is a regulator. ...when it regulates, you’d think. Yet, in many online fora and discussions you see circuits that ‘do something’ but there’s absolutely no regulation taking place.

A Look Inside Douglas Self’s "Small Signal Audio Design" 4th edition

April 3, 2024 by Jan Didden

A Look Inside Douglas Self’s "Small Signal Audio Design" 4th edition

Whether it is power amplifiers, vinyl reproduction preamplifiers, active crossover filters or, as in this case, small-signal circuits for a very wide range of applications, Douglas Self is one of those authors who consistently has produced reference works about technical audio. You may think that as a fourth edition, it would just be a refinement on the three editions that went before it but Self always adds new material and new insights to make it worthwhile to get this new book.

Scott A. Wurcer – An Audio Legend Left Us

March 22, 2024 by Jan Didden

Scott A. Wurcer – An Audio Legend Left Us

Scott Wurcer from Cambridge Mass passed away on March 18, at the age of 74. Scott was one of those people who made a technical contribution to audio that can hardly be overstated. His analog IC designs for Analog Devices are legendary for their creative design and extremely high performance. Scott loved a good life, and I shared many exquisite meals and great wines with him. I will miss him.

Optimizing Variable-Frequency Tone Controls

January 10, 2024 by Douglas Self

Optimizing Variable-Frequency Tone Controls

This article describes bass and treble tone control circuits where the frequency at which control begins in each band is variable over a 16 to 1 range, making it much more useful for correcting speaker deficiencies or room anomalies. Something that very few manufacturers have offered. This article was originally published in audioXpress, December 2023.

New Book by Bob Cordell: Designing Audio Circuits and Systems

January 3, 2024 by Jan Didden

New Book by Bob Cordell: Designing Audio Circuits and Systems

Designing Audio Circuits and Systems will have its 1st Edition published in April 2024, and advanced copies are being sent to reviewers, which includes audioXpress. Bob Cordell, wrote this new book as a comprehensive guide to audio circuits and systems design, beginning with analog audio basics, all the way through to in-depth design techniques for home and professional audio preamps, amplifiers, filters, equalizers, and even headphone amplifiers and DACs.

Audio Electronics: Myths in Tube Circuit Designs

December 20, 2023 by Peter Dieleman

Audio Electronics: Myths in Tube Circuit Designs

Many audioXpress readers will be familiar with Peter Dieleman from his books on the theory and practice of tube amplifiers. In this article he debunks some of the myths, such as load (mis) match in output stages, which is by definition perceived as a bad thing, when that might not be necessarily the case. Another myth example regards the efficiency of a triode output stage versus a pentode.

Improve Your Audio Designs in 2024 with audioXpress

December 12, 2023 by audioXpress Staff

Improve Your Audio Designs in 2024 with audioXpress

In audioXpress January 2024, Martin Turesson explains how Thin-ply Carbon Diaphragm (TPCD) technology can be applied also to headphones, and Claus Futtrup writes about Loudspeaker Bass Reflex Alignments. Paul Marchese discusses Composite Amplifiers, Roger Tall explains how a research effort allowed ClarityCap to understand the impact of resonances in capacitors. Our own Jan Didden interviews Robert Munnig Schmidt, while audio expert Ethan Winer explores audible consequences of jitter in digital audio conversion.

Schurter Extends FMAB NEO Single-Phase Block AC Filter Series with New High-Performance Model

November 30, 2023 by Cristina Costa

Schurter Extends FMAB NEO Single-Phase Block AC Filter Series with New High-Performance Model

Schurter, a leading provider of EMC filters, introduced its new FMAB NEO High-Performance single-phase AC block filter, designed to meet the demands of increasing electromagnetic interference generated in modern-day electronic applications. The new 1-stage-line-filter with high attenuation is available with ground line choke and multiple case variants for class II protection with optimal symmetrical noise attenuation characteristics.

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