Sjöström Audio

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https://emotiva.com/
American manufacturer of amps, preamps, CD players, processors, loudspeakers.
https://youtu.be/VaRg5uITUHY
The state of the art voltage regulator from Linear technology.
http://www.zeilhofer.co.at/wiki/doku.php?id=uln-power-supply
A LT3042 design where you also can buy pcb's. LT3042 is a state of the art voltage regulator.
http://www.tnt-audio.com/clinica/indiscreet.html
A very indiscreet look in the depth of your grooves - A DIY RIAA amplifier design.
http://diyaudio.com
Probably the biggest and best diy audio forum in the world.
http://sjostromaudio.com/pages/index.php/hifi-projects/124-qrv03-headphone-amp
This headphone amplifier design is based on a patent by Mark Alexander. It's a patented current feedback design. Design by Per-Anders Sjöström. You may take a look in the application note AN-211 from Analog Devices. Click on the picture to get a larger...
http://sjostromaudio.com/pages/index.php/hifi-projects/123-qrv02-headphone-amp
  Click on the picture to get a larger view. I designed this amplifier as a result of reading postings at HeadWize. The forum is I'm afraid closed down. I call it "underkill amp" or "Cmoy deluxe". The performance is outrageous in headphone amp terms...
http://sjostromaudio.com/pages/index.php/hifi-projects/122-qrv01-headphone-amp
Click on the picture to get a larger view. I designed this amplifier 1986 and I felt like publishing it now. The excellent MOSFETs from Supertex Inc are hard to get these days (not impossible) so therefore the amp needed to be redesigned a little bit...
http://sjostromaudio.com/pages/index.php/hifi-projects
The website is dedicated for all sorts of audio related audio projects where most pcb's can be bought in the web shop.
http://500px.com
A very good place for semi-professional and professional photographers. You can also sell (and buy) pictures here.