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JoaMat

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Everything posted by JoaMat

  1. Intention is to have updated schematic and BOM at just on place to avoid different versions floating around. This place is the first post of this thread. The advantage is that I, as the disorganized person I’m, cant publish schematic or BOM whenever I feel for it. I need Michaels (mwl168) approval and he is the only one that can make changes public – in the first post of this thread. Anyhow, please take look at the new files for errors or other issues. Below are 3D prints of the new layouts (them I'm authorized to publish myself) Please check for errors. I appreciate feedback especially regarding silkscreen, if anything seems unclear, let me know. Changes: Some resistors value. Offset balance op amp: OPA197, hopefully more reliable. Balance servo op amp: LF356, is more similar to LF353 in the DIY T2. OP27 seems to be reliable in this position though.
  2. Looks fine. You found smd LED with color mark? One remark according the terminal block. The pad is C120-50 meaning pad diameter 120th and hole is 50th wide. Clearance to ground plane is 40th. When designing layout with terminal blocks I keep the entirely area under the block free from ground plane. It will certainly be alright to solder in a terminal block as done above but be sure to solder properly. You don’t want solder to flow out under the block. I always let wires come in from the other (non tube) side.
  3. JoaMat

    Kaldas Research

    Well, I’m back with the original pads and nothing wrong with them. Besides, I don’t like to comment on sonically differences on things I change or modify. On the other hand I like to tell (to much) all here what I’m doing.
  4. Please hurry on! I've run out of money to get them myself.
  5. Today’s mini project. Timer 555 with a few other components. When IN (the empty pad just below left leg of the two color LED) is low then RED, if high then GREEN. Standby/On indicator.
  6. JoaMat

    Kaldas Research

    Removed head band and it looks like this. I suspect it will break, probably sooner than later, so I took some of my wife’s elastic band and replaced the original band. I’m using same elastic band with my two kitchen made headphones and I’ve found the elastics quite comfortable.
  7. Nice to hear. It actually was Roon Radio that led me to this. And do you know what? Jump in car and head to Drammen. Jonas seems to be on stage tomorrow and the day after.
  8. JoaMat

    Kaldas Research

    The bolt was OK, the wire though was broken. Maybe the bolt damage the wire when it was tightened. Anyhow I got the opportunity to see how the RR 1 is built. I also disassembled the driver unit. Spacers seem to be about 1.3 mm thick and the sound when knocking the diaphragm it sounded about right. And yes, everything is easily accessible, except the pads maybe. Bottom line: I like the design. P.S. As the original pads were removed I took a pair of 007 pads
  9. JoaMat

    Kaldas Research

    Now I’ve listened to the RR 1 headphones for a couple of days and I still take vitamins from the left cabinet. Suddenly the right side begin to play very low, which gave me a good reason to disassemble the headphone. It turned out that the wire to front stator was loose. Wires are connected to stators and diaphragm by running M2 bolts through holes in the driver unit and with wire simply put in their respective hole with its bolt. As some of you maybe know I dislike things like terminal blocks and want wires to be soldered direct in place. So now wires are soldered in place with solder lugs and I’m happy again.
  10. Joans Fjeld - Svaert Nok For Meg
  11. Thanks for Judy at Carnegie Hall above.
  12. JoaMat

    Kaldas Research

    more multi working on the left cabinet for time being… lots of multi-vitamins
  13. JoaMat

    Kaldas Research

    Finally she (in the middle, on the Prosecco) arrived from India. Surrounded by her new family.
  14. Looking forward a glimpse of your final enclosure. I’ve no suggestions regarding reducing the gain. Maybe there are folks out there that have.
  15. Thanks for image. Indeed very creative built. No need for fancy cabinet I’d say, unless you have children or cats. Maybe an IR module with the motorized potentiometer for remote convenience.
  16. Congratulations to your successful build of the Carbon. The world needs more good amplifiers. Do you mind post some images?
  17. Great, thank you. To be able to see the trailer I had the VPN service pointing to U.S. I’m sure this is what I saw tonight on the Swedish Public Service.
  18. Swedish television sent a documentary tonight “Miles Davis – Birth of the Cool” https://www.svtplay.se/video/25354227/miles-davis-birth-of-the-cool , can only be seen in the Swedish mainland?. Maybe a VPN service pointing to Sweden might help. Speaker voice and sub title in Swedish, but the rest in English. And the music speaks for itself. Else – Kind of Blue – 31 versions on Qobuz?! Kind Of Blue (Mono Version).pdf
  19. As the good father I’m I gave my son my NAD M51 DAC. I think he needs decent equipment with balanced outputs. So now use this as my DAC. Sounds great!!! Don’t understand why I didn’t finished this long time ago… wife is very understanding…
  20. JoaMat

    Kaldas Research

    Nice! Put my order yesterday at GMT11:00. DHL estimates time of arrival (at my door) on Monday before GMT17:00.
  21. Try MKS2-.47/63/5T, almost same thing? different price.
  22. Qobuz has 13 versions of Miles Davis – Birth of The Cool. A marketing trick signed Philip Kotler?
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