Sjöström Audio

http://www.pat2pdf.org
A nice service which converts US patent into pdf's. The normal output is html plus hopeless tiff files which many web browsers can't show.
http://jonnajinton.se
Jonna Jinton is an artist, blogger, photographer, youtuber, influencer living deep in the woods of north of Sweden: Sometimes she writes (and speaks) in English but she has also a link to Google translate.
http://nevnarien.se
Nevnarien alias Ein Kero is a Swedish photoshop artist, blogger, youtuber, influencer, photographer who likes also to play role games with themes from the viking and knight era.
http://sjostromaudio.com/pages/index.php/hifi-projects/125-qrv04-headhone-amp
Click on the picture to see a preview of the pcb. Interesting features: The pcb fits virtually any single opamp with or without offset trim. Room for good coupling caps (if you must or like), both SMD and regular hole mounted, if you are having...
http://sjostromaudio.com/pages/index.php/hifi-projects/128-qrv07-headphone-amp
Click on the picture to see a larger view of the pcb. The performance is outrageous in headphone amp terms. See the technical data! Interesting features: The pcb fits virtually any single opamp Room for good coupling caps (if you must or like)...
http://sjostromaudio.com/pages/index.php/hifi-projects/109-dct02-the-dc-trap-high-end-style
Click on the pictures to get a larger view. Do you have an amplifier with a (sometimes) buzzing toroid transformer? This DC trap or DC filter removes or at least lowers the buzzing. Interesting features: Room for up to 2 x 10000 uF snap-in high...
http://sjostromaudio.com/pages/index.php/hifi-projects/141-ssb01-sjoestroem-super-buffer-diamond-buffer
SSB-01 - The high performance SMD Diamond buffer     The picture at left shows the prototype boards, revision 0. Click on the pictures on order to get an larger view.   Revision 1 with no errors. Click on the pictures on order to get...
http://sjostromaudio.com/pages/index.php/hifi-projects/142-ssr01-sjoestroem-super-regulator
Click on the picture to get a larger view.   Some background can be found in my JSR-01 project. This design is based on my JSR-01 project and the goal was to make the pcb with hole mounted parts as small and versatile as possible. Interesting features 4...
http://sjostromaudio.com/pages/index.php/hifi-projects/184-ssr04-sjoestroem-super-regulator-power-supply
Click on the picture to get a larger view. Some background can be found in my SSR-01 project. This design is based on my SSR-01 project and the goal was to make the pcb with hole mounted parts as versatile as possible. Interesting features 2-layer...
http://sjostromaudio.com/pages/index.php/hifi-projects/110-jsr01-sjoestroem-super-regulator
  Click on the pictures to get a larger view.   This design has been known at www.diyaudio.com and elsewhere and it has been bescribed thouroughly in couple of articles in The Audio Amateur and also in other magazines, like EDN. The design presented...
http://sjostromaudio.com/pages/index.php/hifi-projects/116-jsr05-sjoestroem-super-regulator
Click on the picture to get a larger view. Some background can be found in my JSR-01 project. This design is based on my JSR-01 project and the goal was to make the pcb with hole mounted parts as small and versatile as possible. This is the negative...