Back in the October 2005 issue, we described a stereo
preamp-lifier module that sets new standards in low-cost, high-performance,
build-it-yourself audio. The module boasts a minimalist design that typically
produces less than .0005% total harmonic distortion and noise. Five
relay-switched RCA inputs and a headphone output simplify wiring and minimise
audio signal degradation.
Altronics are supplying a custom-built laser-cut case for this project, so that the assembly is dead easy. This is a prototype case - the final version has extra ventilation slots to ensure adequate cooling.
A matching headphone amplifier followed in the November issue.
This has already proven quite popular and is undoubtedly the cleanest and
quiet-est we’ve ever described. Although designed for use with the preamp, the
headphone amplifier also works as a standalone unit and can be connected
directly to the line output of a CD or MP3 player. It has the ability to drive
headphones down to 8Ω impedance with low distortion, while a second output
socket allows connection of two pairs of higher impedance units.
Then in April this year, we provided details of an infrared
remote control module to mate with the preamplifier. Using virtually any
universal remote, this module allows you to take charge of the preamp from your
lounge chair – an indispensable addition to any audio setup!