Due to excessive order quantity over the last 18 months, this page has been severely neglected. As there are a number of successful projects nearing the end of their lives, time will be set aside to detail their design process and philosophy, along with publication of complete design and measurement files.
December 2025
A complete phono pre-amplifier built around single stage while using the input network as a second-order subsonic filter, and then running the entire thing off an unregulated power supply certainly sounds like quite a wild stretch, but it worked remarkably well for the company's second product back in August 2022. Full technical analysis, design decisions, parts list, and all the relevant files await within.
December 2025
The mono switch seems to have evaporated from phono stages at the end of the 20th century, with most units on the market today leaving it out regardless of price. Although mono discs can be played through a stereo pre-amplifier without any gross ill effects, there are substantial and audible benefits to be had from summing the two channels together; summarised and demonstrated with sound samples.
2021
Line level inputs are an essential part of most audio equipment, and although nothing could seem simpler than connecting a line level voltage to internal circuitry, there is almost always a need for some interfacing circuitry. A discussion of line level in the real world, the requirements of the interfacing circuitry, RF filtering, versatile unbalanced line inputs, and several balanced input circuits for all occasions.
2021
VU meters are certainly very aesthetically pleasing devices, and are still quite useful in a domestic setting, but unfortunately the contemporary circuitry that feeds them falls seriously short in many ways. A brief discussion of the VU meter standard followed by a revised list of objectives and an improved driver circuit.
2020
Active studio monitors are a very attractive option for high quality home listening. However, many HiFi amplifiers lack even an unbalanced line level output, making their mating to a typical system seemingly impossible. A brief discussion of why active is better, followed by a simple, low cost passive circuit to allow a balanced line level connection to standard amplifier speaker level outputs.
2020
