All items in category Project Articles
You Can DIY! Build an External Phono Preamplifier
by Bill Christie

You Can DIY! Build an External Phono Preamplifier

Many of today’s receivers and preamplifier processors do not have phonograph inputs, so anyone with a vinyl collection will need an external phono preamplifier. Bill Christie decided to build one using a TI high-performance op-amp, since the data sheet already included the schematic for a phono preamplifier. This article was originally published in audioXpress, July 2013.
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You Can DIY! The TERESA Amplifier
by Harald Frank

You Can DIY! The TERESA Amplifier

TERESA amplifier is a simple and cascadable Class-AB design. The name is an acronym for manufacturers TExas Instruments and REneSAs, who provided the parts for the core of this amplifier. The result is worth seeing and hearing! This DIY project does not require any special experience in detailed analog circuit technology to build. This article was originally published in audioXpress, November 2014.
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On Angel’s Wings, Part 2 - A Speaker Design for the Bohlender Graebener RD-75 Planar Magnetic Driver
by Thomas Perazella

On Angel’s Wings, Part 2 - A Speaker Design for the Bohlender Graebener RD-75 Planar Magnetic Driver

In January and February 2001, audioXPress included a project from Thomas Perazella, describing in detail the design and construction of a speaker using the Bohlender Graebener RD-75 planar magnetic driver. This is the second part of the project, detailing the final part of the speaker construction, measurements and listening trials.
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On Angel’s Wings, Part 1 - A Speaker Design for the Bohlender Graebener RD-75 Planar Magnetic Driver
by Thomas Perazella

On Angel’s Wings, Part 1 - A Speaker Design for the Bohlender Graebener RD-75 Planar Magnetic Driver

In January 2001, the first audioXPress magazine issue (Vol. 32 No.1) included this project from Thomas Perazella. Published in two parts, the articles described in detail the design and construction of a speaker using the Bohlender Graebener RD-75 planar magnetic driver, including references to previous experiments with dipole baffles. This is the first part of the project.
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The ImPasse Preamplifier
by Stuart Yaniger

The ImPasse Preamplifier

Stuart Yaniger wrote a great article for audioXpress in February 2009, The ImPasse Preamplifier, describing a tube preamp to drive a pair of Nelson Pass’ First Watt F4’s (or other low-to-unity-gain power amplifiers) in balanced mono. Yaniger’s preamp is truly an elegant design with very, very low distortion, using a 6SN7 to drive a 6922 in balanced mode. There are LED’s, NE2H neon lamps and depletion MOSFETs in the design.
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EB-604/410 All-JFET Line Amp Starter Kit
by Erno Borbely

EB-604/410 All-JFET Line Amp Starter Kit

This article continues the classic JFETs series of articles by Erno Borbely and introduces one of his starter kits with an all-JFET line amp. Originally published in audioXpress March 2005 this is an essential reading to understand the “building blocks” of the “Borbely amplifiers”.
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JFETs: The New Frontier, Part 2
by Erno Borbely

JFETs: The New Frontier, Part 2

The basic circuits on which Erno Borbely based most of his projects are described in “JFETs: The New Frontiers, Part I and II,” published in Audio Electronics AE 5/99 and 6/99, and “All-FET Line Amp,” published in audioXpress May 2002. As the author admits, these were the “building blocks” on which many - if not all - of his amplifiers are based. This articles continues his JFETs series and was originally published in Audio Electronics, Vol 5 1999.
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JFETs: The New Frontier, Part 1
by Erno Borbely

JFETs: The New Frontier, Part 1

The basic circuits on which Erno Borbely based most of his projects are described in “JFETs: The New Frontiers, Part I and II,” published in Audio Electronics AE 5/99 and 6/99. Referring to these articles frequently, the author admits, these were the “building blocks” on which many - if not all - of his amplifiers are based. This article is the first part, as originally published in Audio Electronics, Vol. 5 1999.
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Glass Audio Vault: The Remaking of a Champ
by Kirk Elliott

Glass Audio Vault: The Remaking of a Champ

Introduced in 1948, the Fender Champ single-ended 5 W guitar amplifier is “the” classic tube practice amplifier and it has been remade a few times over. In 1992, Kirk Elliott shared his take on the design, transforming the stock Champ into a quieter, safer, and more reliable studio amplifier. This article was originally published in Glass Audio Volume 4, Number 2, 1992.
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High End 120W MOSFET IC Driven Amp
by Jack Walton

High End 120W MOSFET IC Driven Amp

A great solid-state project where National Semiconductor’s (since 2011, a part of Texas Instruments) LM4702 meets up with Renesas lateral MOSFETs, this article by Jack Walton was originally published in audioXpress July 2007 and it is still cited as a reference today. An ideal project for the DIY enthusiasts.
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