Sjöström Audio

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https://audio-circuit.dk
Audo Circuit DK
Jan Dupont has a big collection of schematics and service manuals for all sorts of audio equipment, such as amplifiers and loudspeakers.
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https://www.hifiberry.com
HifiBerry
HifiBerry has various DIY stuff usch as DAC's preamps, RIAA amps, power amps, power supplies etc.
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http://www.crazy-audio.com
Crazy Audio
Crazy Audio has various DIY stuff usch as DAC's preamps, RIAA amps, power amps, power supplies etc.
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http://www.ant-audio.co.uk/Theory/Kora3T_Phono_Stage_circuits.pdf
Kora MC preamp
A MC preamp designed by Alex Nikitin. The design is called Kora.
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http://sjostromaudio.com/pages/index.php/hifi-projects/133-qsxm3-the-extreme-phono-riaa-amplifier
QSXM3 The extreme phono (RIAA) amplifier
QSX Mark III - The extreme phono (RIAA) amplifier       Click on the picture to get a larger view. The printed circuit board of the QSX Mark III Amplifier. Interesting features In order to get an extremely linear and extremely low distortion design...
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http://sjostromaudio.com/pages/index.php/hifi-projects/132-qsxm2-the-extreme-phono-riaa-amplifier
QSXM2 The extreme phono (RIAA) amplifier
QSX Mark II - The extreme phono (RIAA) amplifier   Click on the picture to get a larger view. The front view of the original QSX Amplifier from 1986. Click on the picture to get a larger view. The top view of the QSX Amplifier pcb. High...
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http://www.tnt-audio.com/clinica/indiscreet.html
TNT inDiscreet Phono Pre-amplifier
A very indiscreet look in the depth of your grooves - A DIY RIAA amplifier design.
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http://www.world-designs.co.uk
World Designs
DIY kits of tube amps, turntables, loudspeakers etc.
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http://www.ezonaudio.se
Urban Erixon, Kalix Elektro Design AB, KEDAB
Urban Erixon from north of the pole cirle in Sweden is a very skilled designer of audio. Power amplifers and DAC's are his thing. He is also very good in mechanics. Check out his enclosures.
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http://www.vinylzone.com/phonopre.asp
The Analog Addicts Phono Preamp
Interesting RIAA correction amp with an OPA637 as main part. The designer is Thorsten Lösch (or Loesch) alias Kuei Yang Wang.
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http://www.raysamuelsaudio.com
Ray Samuels Audio
Nice looking RIAA vinyl amp and other products. Kits available.
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http://www.pilghamaudio.com
Pilgham Audio
Nice hand built audio stuff including a super regulator.
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http://pmacura.cz/audiopage.html
Pavel Macura Audio
Pavel Macura has made a couple of very nice amplifier designs. He sells also pcb's.
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http://www.parttimeprojects.com/audio/diy
Part Time Projects- Audio projects
DIY audio projects, including a differential input (buffered) LM3886 GainClone amplifier, an LM4780 parallel ChipAmp, a Krell KSA 50 Clone, a preamplifier, a battery powered differential line driver, a soft start circuit, and a few .wav files of audio...
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http://www.paia.com/riaa.htm
PAiA: riaa Phono Preamp
Simple RIAA vinyl amp.
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http://www.lehmannaudio.de
Lehmann audio - music by design
Nice looking and high performing RIAA vinyl amps  and headphone ams.
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http://www.klaus-boening.de
Klaus Boening
This german guy is dedicated to tube amps and vinyl. He has also designed a very interesting balanced RIAA phono amp and also a turntable.
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http://www.keld.eu/diy
Keld's DIY
This is Keld's DIY site that contains various projects including my QRP01. Original here.
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Holger Barske DIY
Holger Barske's vinyl, phono stuff. Impressive turntable!
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http://www.garbz.com/electronics-static/index.html
Garbz Electronics – What dafaq was he thinking
Lots of DIY audio stuff.
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