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(mis) Adventures in Hi-Fi

Category: DIY Audio

Ray Samuels Audio XP-7 Headphone Amplifier clone

Posted on 4 May 20194 April 2020

I bought a mixed bag of boards recently and came across this one knowing nothing about it, apart from it appearing to be a headphone amp. I finally found out that it is a clone of a commercial project – the Emmeline XP-7 which has been around for a number of years. A cursory search…

LM3886 Amplifier Build Files by 00940

Posted on 1 May 201913 December 2020

A thread on DIYAudio was concerned with creating an open source PCB layout for the LM3886 amplifier. Although initiated and largely designed by user 00940, there has been some input from others, including advice from Tom Christiansen of Neurochrome, resulting in this implementation. Gerber files, the set of files necessary for a PCB lab to…

Chipamp power supply

Posted on 1 May 201926 September 2020

This power supply comes courtesy of Brian Bell, former owner of Chipamp.com. After relinquishing control of this small company to another individual, the company appeared to go downhill, but after its demise, Brian generously released the designs he created, including this power supply, into the public domain. If board dimensions are kept below 100mm X…

Public Domain Audio Project PCBs

Posted on 1 May 201926 September 2020

This page is a repository for build files which are considered public domain. It is hoped that by distributing these files widely, they remain visible to DIY enthusiasts looking for free projects that do not infringe on the copyright or intellectual property of the designer. You can download these projects, modify them as you wish…

An open source LM3886 chip amplifier.

Posted on 2 April 201925 June 2019

I decided to build an amplifier for a friend. There are a number of good chips for amplifiers and I managed to purchase a pair of LM3886 opamps new for £5 from a seller on DIYAudio a few months ago. With the chip decided upon, a suitable layout was sought. As much as I would…

Grounding resources

Posted on 2 April 20197 February 2020

It seems that grounding and safety earth is one of the most confusing aspects of this hobby for beginners like me.Here are some resources that I have found useful. I will add more as I come across them. https://hifisonix.com/ground-loops/ http://sound-au.com/earthing.htm https://www.diyaudio.com/forums/solid-state/324413-dozens-schemes-wire-amp.html

Elliott Sound Projects P97 Pre-amplifier

Posted on 11 February 201930 September 2020

Following the completion of the PeeCeeBee power amplifier, I wanted to build a pre-amplifier to go with it. At present I’m using a Schiit Modi 2 & Magni 3 combo for DAC and preamp duties, and whilst these are perfectly adequate, I wanted a preamp to match the style of the PeeCeeBee. In contrast with…

PeeCeeBee V4 Class AB amplifier

Posted on 9 December 20187 February 2020

This latest build is the PeeCeeBee, a discrete Class AB amplifier, now in its fourth iteration. It was designed and made available by Shaan through a group buy over at DIYAudio. He has recently designed a very nice PSU as well and so I ordered a couple, one of which powers this amp. Although Shaan…

Workspace listening setup

Posted on 8 October 201825 June 2019

For this short post I thought I’d just show the setup I’m using for the spare bedroom now that both Idiot Children have left home. The room still has a bed but I’ve managed to have a desk for my electronics.

CMoy Mark IV – preamplifier

Posted on 7 October 201824 November 2019

Whilst many modern sources provide enough voltage to feed a reasonable signal to amplifiers, some, such as the Pass ACA, may benefit from a boost in gain, particularly if paired with inefficient speakers. As I had most of the parts, I thought I would try a variation of the CMoy headphone amplifier as a preamplifier…

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