Building an AudioNote PQ Signature Kit
Mostlyaudio’s article about building the AudioNote Kit1 PQ Signature Edition SET amplifier. “This kit will build a very high quality Single-Ended, Class A, directly heated triode amplifier. The amplifier will support a single line source (unless a pre-amp is used that will support more sources) as it incorporates a volume control. It has a class A output of 8watts per channel. Don’t be put off by this seemingly low wattage as it is every bit as loud, position for position, as my my old 40W Linn solid state amplifier was through the same speakers. It also has an input impedance of around 100K which is more than ample for a huge range of source components.” Link.
Aaron writes “Most of us cannot afford fancy 7.1 surround sound systems or feel that we do not utilize the computer’s audio functions enough to reap the benefit of one. However, most of us have stereos. That and a few cables is all you need to enjoy a nice audio system without damaging your bank account. In this article, I will show you an easy way to use your stereo as computer speakers for a nice sound system at a very low cost.” Thanks Star! 
Excellent guide on replacing capacitors in old radios “Second only to power cords, capacitors are the most failure-prone components in old radios. In a professional overhaul, it is common to replace all of a radio’s large electrolytic capacitors and small paper capacitors. This article explains how to do just that. In many cases, this “recapping” is all that the radio needs to be restored to health.” 
Paul from Dotmatrixsynth makes musical instruments out of printers, here writes – “I’ve got an ongoing project, reprogramming the firmware in these 1985 Epson LQ-500 printers to turn them into musical instruments. I originally just wanted to make a sort of homemade mellotron, but it’s evolved into a much deeper project. These printers (like all printers) have a computer inside that operates all the motors and handles the parallel port, etc. The software that drives that computer is all on an EPROM (a reprogrammable ROM chip.) I remove the EPROM, erase it, and reprogram it with my own software that I’ve developed by reverse engineering the printer and its computer.” 
Tomi writes – “This is a simple microphone preamplifier circuit which you can use between your microphone and stereo amplifier. This circuit amplifier microphone suitable for use with normal home stereo amplifier line/CD/aux/tape inputs. This microphone preamplifier can take both dynamic and electret microphone inputs (preamplifier provides power foe electret microphone elements). The idea of this circuit is to keep the design as simple as possible to be easy to build. That was my goal when I needed a simple external microphone preamplifier for my mixer. The performance of the circuit is nothing superior but can be used with many not so serious projects.” 
Nice use of a mint tin! – “This site features projects and circuits for building stereo microphones from low-cost Panasonic electret microphone capsules. Included are Mid-Side, XY, and Blumlein microphone setups. In addition, there are interesting related circuits and links to sites with microphone information and parts sources.”