An envelope dropped through the letterbox yesterday morning containing a PCB I’m quite excited about, a preamplifier with a twist. In a similar vein to the Pass H2 harmonic generator, this preamplifier has a real-time, adjustable harmonic distortion level. The circuit was designed by Shaan and is offered for sale in a group buy on…
Tag: pcb
DC Splitter for Bench PSU
There is often a need for a dual voltage supply when dealing with audio (op amps often require dual supplies for example) but there may not be a suitable one at hand. There is, however, usually a single supply, a wall adaptor, bench supply etc. and, at its most basic, all that is required to…
A simple opamp tester
I’ve been having some problems with what should have been a straightforward build of a headphone amplifier and wasn’t sure if I’d damaged the op amps or if they were still useful. I came across this tester circuit at Tangentsoft and decided to build it. It requires a TLE2426 rail splitter virtual ground, a few…
Nelson Pass H2 Harmonic Generator
In a nice turn of events, my anniversary of 2 years as a member of the DIYAudio.com forum was coincidentally marked with a nice little gift. Nelson Pass and the good people at DIYAudio host an event called Burning Amp annually. It allows people to see and hear designs made by other DIY audio enthusiasts…
A novice’s guide to getting PCBs fabricated
In the previous post I talked about sourcing kits and boards suitable for novices. Once confidence builds and a little experience and knowledge is gained, other projects beckon and you find yourself perusing projects designed by generous folk who release their designs into the wild. Although most are usually just schematics, occasionally these may come…
A novice’s guide to DIY kits and boards with support
Whilst there is a proliferation of DIY audio PCBs available through sites such as Ebay and the many other Chinese based sites, there appears to be a relative dearth of suppliers of DIY kits and boards with accompanying support. For those with a little experience, a PCB with accompanying schematic is all that is required…
LM3886 Amplifier Build Files by 00940
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
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
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…