All items tagged with MOSFET (38)

Fresh From the Bench: Parasound Halo JC 5 Stereo Power Amplifier - The Measurements

October 27, 2021 by Stuart Yaniger

Fresh From the Bench: Parasound Halo JC 5 Stereo Power Amplifier - The Measurements

Oliver A. Masciarotte was looking for an amplifier that he could respect without emptying his bank account. Richard Schram offered to send the Parasound JC 5, his company’s largest stereo power amplifier for evaluation. Anticipating the fun of enjoying the pleasures of this John Curl design, Oliver accepted the challenge, and Stuart Yaniger tested the JC 5 to confirm the amplifier’s merits with actual measurements. This article was originally published in audioXpress, September 2021.

Fresh From the Bench: Parasound Halo JC 5 Stereo Power Amplifier - Traditional Goodness

October 27, 2021 by Oliver A.Masciarotte

Fresh From the Bench: Parasound Halo JC 5 Stereo Power Amplifier - Traditional Goodness

Oliver Masciarotte was looking for an amplifier that he could respect without emptying his bank account. Richard Schram offered to send the Parasound JC 5, his company’s largest stereo power amplifier for evaluation. Anticipating the fun of enjoying the pleasures of this John Curl design, Oliver accepted the challenge, and Stuart Yaniger tested the JC 5 to confirm the amplifier’s merits with actual measurements. This article was originally published in audioXpress, September 2021.

audioXpress August 2021 Focus on Acoustics Issue Now Available

July 13, 2021 by audioXpress Staff

audioXpress August 2021 Focus on Acoustics Issue Now Available

The August 2021 edition of audioXpress is now available in print and online. Read our Acoustical Solutions Round-Up 2021 and enjoy the DIY perspectives from Ethan Winer and Thomas Perazella on dealing with room measurements and treatments. David Logvin reviews Audio Precision's APx517B Acoustic Audio Analyzer, while Richard Honeycutt reflects on acoustic challenges for online and in-person meetings. And we conclude the DH-220C MOSFET Power Amplifier article by Bob Cordell and Rick Savas, and the VSCS Amplifier project in this edition.

Searching for a Unicorn Part 2: Generating a Good Signal Source

January 27, 2021 by Brian Lowe

Searching for a Unicorn Part 2: Generating a Good Signal Source

In this second article, Brian Lowe (Belleson LLC) continues his search for the Unicorn of "Measuring Voltage Regulator Ripple Rejection," this time focusing on the test fixtures. Testing a voltage regulator with exceptionally good performance requires an even more exceptional signal source and measurement setup to measure sub-microVolt ripple across a wide frequency range. Complementing the final article, Jan Didden, offers an informative sidebar about super regulators. This article was originally published in audioXpress, June 2019.

Searching for a Unicorn Part 1: Measuring Voltage Regulator Ripple Rejection

January 20, 2021 by Brian Lowe

Searching for a Unicorn Part 1: Measuring Voltage Regulator Ripple Rejection

In this article Brian Lowe shares a fascinating journey in his search for a "Unicorn" that is measuring voltage regulator ripple rejection - or power supply rejection ratio (PSRR). Lowe is the founder and principle engineer at Belleson, LLC, and he has devoted a lot of time to this fascinating "quest." This article was originally published in audioXpress, May 2019.

Panasonic Completes Transfer of Its Semiconductor Business to Nuvoton

September 4, 2020 by audioXpress Staff

Panasonic Completes Transfer of Its Semiconductor Business to Nuvoton

Panasonic Corporation, based in Osaka, Japan, recently confirmed that it has completed the previously announced transfer of its semiconductor business to Nuvoton Technology Corporation, a Taiwan-based semiconductor company under the umbrella of Winbond Electronics Corporation group, following the receipt of regulatory approvals.

MagnaChip Launches New MOSFET to Enhance Protection for Wireless Earphones While Recharging

February 25, 2020 by audioXpress Staff

MagnaChip Launches New MOSFET to Enhance Protection for Wireless Earphones While Recharging

MagnaChip Semiconductor, a designer and manufacturer of analog and mixed-signal semiconductor products from South Korea, announced the company is entering the wireless earphone market with the introduction of a new MOSFET solution that helps preventing the battery in these wireless devices from overcharging. This MOSFET is designed to control excessive current flowing into wireless earphones while recharging the battery in order to protect wireless earphones from being damaged.

Chord Electronics Ultima Amplifier Technology Expands with Ultima 2 and Ultima 3 Mono Power Amplifiers

May 16, 2019 by audioXpress Staff

Chord Electronics Ultima Amplifier Technology Expands with Ultima 2 and Ultima 3 Mono Power Amplifiers

Three decades in development, John Franks’ next-generation Ultima amplifier technology filters down into two new mono power amplifiers, the Ultima 2 and Ultima 3, part of Chord Electronics’ ongoing 30th-anniversary celebrations. First unveiled in October 2018, the new Ultima amplifier topology, to date exclusive to the range-topping £30,000 Ultima power amp, is now more affordable than ever, with the two new mono power amps sharing the same Chord Electronics DNA.

A Hybrid Tube/MOSFET Headphone Amplifier

March 12, 2018 by Erno Borbely

A Hybrid Tube/MOSFET Headphone Amplifier

A popular hybrid amp design available for headphone use, this single-ended (SE) pure Class-A amplifier is capable of driving headphones between 32 and 600Ω, and was derived from an original tube/MOSFET line amplifier project, published by Erno Borbely in Glass Audio (1/98). Originally published in audioXpress in April 2005, this project was meanwhile extensively discussed in multiple DIY audio forums all over the world and is probably one of the most tested of Erno Borbely's designs, with multiple iterations frequently published on blogs and other publications.

T-reg: A High-Voltage Regulator for Tube Amps

November 1, 2017 by Jan Didden

T-reg: A High-Voltage Regulator for Tube Amps

Tube amplifiers can benefit from regulated and stabilized power supplies, especially sensitive preamplifier stages, but also (single-ended) power amps. But traditional high-voltage regulators add several extra tubes, complexity, and power losses, while good performance is not easy to obtain. This article, published in audioXpress, April 2009, describes a novel design that is very simple yet offers excellent performance. Output voltage is fully adjustable with a single resistor without any compromises in performance.

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