All items tagged with Linear Integrated Systems (11)

Joachim Gerhard on Low Noise Phono Stages: The Discrete INA Design

November 13, 2024 by Jan Didden

Joachim Gerhard on Low Noise Phono Stages: The Discrete INA Design

Ask audio industry insiders and audiophiles alike about Joachim Gerhard, and chances are that they mention the many high performance speakers he designed over the years. But he also has a great track record designing phono preamps and this interview explores that aspect of Joachim’s career. In this second part of the interview, Jan Didden explores Gerhard's design ideas and goes into details on his Discrete INA design, a discrete input stage instrumentation amplifier topology.

Linear Systems Announces LSK489 Premier Performance JFET Re-Release

August 4, 2022 by audioXpress Staff

Linear Systems Announces LSK489 Premier Performance JFET Re-Release

Linear Integrated Systems, the world class producer of ultra-low-noise JFETS and other small-signal discrete semiconductors, has announced the re-release of its LSK489 discrete component with specialized parameter grading. The LSK489 is one of the world's premier JFETs optimized for use in high-end sensor front-end amplification designs, and the re-release in 2022 introduces improved manufacturing consistency.

Linear Systems Announces 2022 Small-Signal Discrete Semiconductor Data Book

April 13, 2022 by audioXpress Staff

Linear Systems Announces 2022 Small-Signal Discrete Semiconductor Data Book

Linear Integrated Systems, the world-class designer and manufacturer of precision, high-performance, small-signal discrete semiconductors, announced the release of its 2022 Small Signal Discrete Data Book. The Data Book provides all Linear Systems’ datasheets in one spot. The Table of Contents includes product category, part number and part description, so users can browse the entire product line with ease. There is also a dedicated section on packages, highlighting the latest package innovations and packing options.

You Can DIY! The DH-220C MOSFET Power Amplifier - Part 2 Construction and Testing Instructions

December 15, 2021 by Bob Cordell and Rick Savas

You Can DIY! The DH-220C MOSFET Power Amplifier - Part 2 Construction and Testing Instructions

This reference DIY project details of an upgrade construction for the legendary Hafler DH-220 lateral MOSFET power amplifier, which can also be used to upgrade other Hafler models or even inspire new designs. The design is implemented on two PCBs, one as a drop-in replacement for the original Hafler circuit board and another board that consolidates all of the output stage wiring and components within the heatsink and under the main PCB. After the authors detailed the design and performance of the DH-220C upgrade amplifier, in this second part of the article, Bob Cordell and Rick Savas discuss the construction and testing. This article was originally published in audioXpress, August 2021.

You Can DIY! The DH-220C MOSFET Power Amplifier - Part 1 The Circuit

December 8, 2021 by Bob Cordell and Rick Savas

You Can DIY! The DH-220C MOSFET Power Amplifier - Part 1 The Circuit

This article offers the first serving of an amazing DIY project from amplifier experts Bob Cordell and Rick Savas with an upgrade for the legendary Hafler DH-220 lateral MOSFET power amplifier. The design is implemented on two PCBs, one as a drop-in replacement for the original Hafler circuit board and the other as a new board that consolidates all of the output stage wiring and components within the heatsink and under the main PCB. This article was originally published in audioXpress, July 2021

Build a Discrete High Output Current Buffer with JFET Input

June 24, 2021 by Dimitri Danyuk

Build a Discrete High Output Current Buffer with JFET Input

This article from Dimitri Danyuk explores ways to provide better isolation between input and output terminals and lower input noise current using JFETs from Linear Integrated Systems. For unity-gain buffer applications there are many open-loop IC buffers on the market based on bipolar technology. They are mostly complementary emitter followers connected in series. With the appearance of complementary JFETs from Linear Integrated Systems, it is possible to construct a discrete buffer with JFET input. This article was originally published in audioXpress, March 2019.

Measurements Rate New SMT Low-Voltage JFETs Under Consistent Conditions - An Update Using Modern JFETs

April 14, 2021 by Dimitri Danyuk

Measurements Rate New SMT Low-Voltage JFETs Under Consistent Conditions - An Update Using Modern JFETs

In 2013, Dimitri Danyuk wrote an article that presented apples-to-apples test results for noise densities for several low-noise discrete, SMT, and n-JFETs. In this follow-up article, Danyuk brings us new measurements, updating his design note with measurements of JFET components that appeared more recently on the market. The tests used the same operating conditions so that designers can make a fair comparison for their applications. This article was originally published in audioXpress, December 2018.

Linear Systems Reintroduces LSK389 Ultra-Low Noise N-Channel JFET

February 26, 2020 by audioXpress Staff

Linear Systems Reintroduces LSK389 Ultra-Low Noise N-Channel JFET

Linear Systems has reintroduced its most popular part, the LSK389, which the Silicon Valley company calls the industry’s first 100% noise tested, ultra-low noise (en = 1.3nV/√Hz (typ), f = 1.0kHz and NBW = 1.0Hz), monolithic dual, n-channel JFET. New test capability screens to a billionth of a volt (nV/√Hz) of noise now ensures that all LSK389s devices produce no burst (RTN or popcorn) noise and meet or exceed 1/f and broadband noise specifications.

audioXpress March 2019 Is Now Available. Time for Audio Test and Measurements!

February 11, 2019 by audioXpress Staff

audioXpress March 2019 Is Now Available. Time for Audio Test and Measurements!

Get to the bench, it's Test and Measurement time. In this edition, you will find a Market Update with the latest audio measurement solutions available to the audio industry. Stuart Yaniger reviews the new Earphone Audio Response System from miniDSP, Joe Begin explains how to measure speech intelligibility, and Jonathan Novick details how to use external attenuators for measurements. Geoff Hill discusses why total system efficiency should be the target in loudspeaker design, and Dimitri Danyuk explores a discrete high output current buffer with JFET input.

Reference Reading audioXpress October 2017 is Now Available!

September 11, 2017 by audioXpress Staff

Reference Reading audioXpress October 2017 is Now Available!

audioXpress October 2017 brings another strong combination of inside perspective, educational value, and practical projects. In this edition, Christopher Paul explains his Denali Voltage Reference low impedance amplifier design, Stuart Yaniger does a full objective review of the surprising Markaudio-Sota Viotti speakers, we explain how Harman is using COMSOL Multiphysics simulation software on car audio, Richard Honeycutt explains the story of the Circlotron amplifiers and so much more...

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