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White Noise is the audio projects website of David White. The series of projects
began in 1998 with the MOS100 high fidelity power amplifier designed by the author and
fully described in Electronics Today International, Volume 27, Issue 7 ( June/July )
pp47-53 & Issue 8 ( July/August ) pp49-52, 1998. Hundreds of these power amplifiers have
since been made by DIY audio buffs, and they have reaped universal approval from their
constructors.
Encouraged by the success of the MOS100 I decided to design a range of professional
grade audio electronics projects which are economic to construct in standard form, but
capable of upgrade to a specification far in excess of most high end manufactured products.
Even the standard versions of the projects use components superior to those employed in the
vast majority of manufactured audio equipment.
The printed circuit boards for these projects are custom made to very high
standards by a major pcb manufacturer. The pcbs are all made of fibre glass, roller tinned,
solder masked on both sides, and with all of the component outlines and identifiers silk
screened onto the top surface of the board. I have had a lot of positive feedback on the
high quality of these printed circuit boards.
Another key decision was that the projects should preferably be original designs,
or at worst substantive redesigns of classic audio circuitry. "Application Note
Engineering", beloved of entry and mid-level audio manufacturers, has no place in my design
philosophy.
Printed circuit boards are available for the projects detailed on this website as
are detailed construction notes which include full circuit schematics annotated with all
component values and semiconductor types. I supply schematics as a matter of course
because I believe that constructors should know exactly what they are building. It is
noticeable that manufacturers proud of their excellent products, like Bryston, share my
philosophy in this respect. Draw your own conclusions about the others!
I designed the projects so that they are easy to construct; if you can solder
reasonably well then you can successfully build any of these projects. Few of the circuits
require any setting up, power amplifiers are the main exception, but those that do need
only a fairly basic multimeter in the way of test equipment.
My complete range of audio projects includes; three different power amplifiers;
two high voltage, high current, split rail power supplies ( for power amplifiers ); one
low voltage, low current, split rail power supply ( for line level circuitry ); an
audiophile grade rectifier bridge; a stereo phono stage; a fourth order active crossover
( for subwoofers and active loudspeaker systems ); a buffer amplifier; a headphone
amplifier; stereo, balanced input and output modules; a precision switched attenuator
( to replace volume, balance and tone control potentiometers ); a complete passive or
buffered preamp ( including fully finished metal case, knobs, connectors, power supply
etc ); and a complete and cased headphone amplifier. A second power amplifier project has
recently been published in Electronics World, August 2001, Vol 107, No 1784. Not all of the
projects are featured on the website yet ( although they will be, real soon now! ), but
details are available by email.
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