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  1. amb

    AMB is temporarily down

    Dear friends, is currently down due to a problem at the ISP. Unfortunately it is taking a long time for them to fix it. I’m very upset that it has taken so long without resolution, and it appears that it will be down for maybe another several days. The level of service I’m receiving...
  2. amb

    Cavalli-Kan Kumisa III help? CK2III

    What switch mode DC regulators? Are you thinking of a different amp?
  3. amb

    South Bay area Head-Fi meet late 2016 + impressions - Alum Rock Library 11-26-16

    A photo gallery of the meet, as taken from my camera, is here:
  4. amb

    Where are all of the builders?

    LOL, no. I was "gone" long before that blogger guy appeared. There was a major exodus back to headwize around the 2005-2006 time frame, when the atmosphere in this forum got real hostile (thanks to a former moderator who is no longer with us). I created the AMB DIY audio forum back in early...
  5. amb

    AMB Sigma 78 and Sigma 79

    Here's a photo of a CK²III headphone amp PCB upgraded with σ78 and σ79 regulators:
  6. amb

    AMB Sigma 78 and Sigma 79

    If you have gear that uses the 78xx and/or 79xx series voltage regulator in TO-220 packages, and ultra low noise and high PSRR are important, then it is a candidate for upgrading to the σ78 /σ79. σ78 and σ79 (as supplied with regulator chip pre-soldered): A fully-populated σ78 (minus the...
  7. amb

    The Beta 22 Thread

    It's a Chinese fake, not based on genuine boards, and most likely uses inferior parts. Also, that big power transformer situated so close to the amp boards will surely cause magnetic interference.
  8. amb

    New project from AMB Labs announced: Gamma 1.5

    Many people have built the γ1.5. For some reason they're not posting here much, but you can find much more at AMB DIY audio forum.
  9. amb

    San Jose, CA Local Head-Fi Meet - January 30th at Alum Rock Library Event Room

    They are DIY designs, so you can't just "buy one". You have to build it, or find someone to do it for you. The total cost could vary a lot, depending on configuration, parts selection and chassis selection/custom work involved. I can't really quote a price. But the γ3 and β22 are premium...
  10. amb

    Best DIY Dac (Late 2015 edition)

    The impressive performance is not due to one thing alone. Every little bit helps. In the γ3 no corners were cut. The whole really is the sum of its parts... plus a lot of care in its implementation.
  11. amb

    Best DIY Dac (Late 2015 edition)

    Go to the γ3 website and look in the Specifications section. :)
  12. amb

    Best DIY Dac (Late 2015 edition)

    Just FYI, the full γ3 website is now up, along with its companion module, the γ24 DAC core. They are both released and available as of yesterday.
  13. amb

    Gamma-2 (γ2) DAC Thread

    Yes, you can do that. The fact that it could serve as a headphone amp simply means that it has a bit of gain (3x default) and has very low output impedance (a good thing in any event). If you use it as just a DAC, then you can set the γ1.5's volume knob to somewhere around the 1-2 o'clock...
  14. amb

    Gamma-2 (γ2) DAC Thread

    The γ2 is capable of 24/192 via its coax or optical inputs, but only 16/48 maximum via USB. If you are interested in 24/192 USB audio in a small form factor, you should look at the new γ1.5. Both will work with iPhone/iPad via the USB Camera connection kit, but through a powered USB hub because...
  15. amb

    Gamma-2 (γ2) DAC Thread

    Such ground loop isolators typically contain a cheap transformer that will affect sound quality. It would appear that the Schiit amp does not have a ground loop breaker inside (i.e., its signal ground is connected directly to its AC ground). If it was a DIY amp then I would recommend a...
  16. amb

    Gamma-2 (γ2) DAC Thread

    Is your computer a desktop or laptop? If the latter, does this noise occur when running on battery? Also what are you using as an amp? Is it AC powered too? I suspect a ground loop via your USB cable: computer > USB cable > gamma2 > interconnect cable > amp > AC power cord > wall outlet > AC...
  17. amb

    :sunrise: Official 2015 SF Head-Fi Meet, July 18, 2015, Doubletree San Francisco Airport

    I need a full table. Aside from an assortment of headphones and amps, I will bring a prototype γ3 high resolution DAC, and the new γ1.5 portable high resolution USB DAC/amp. Amps include the β22, Mini3 and others. I will also bring Sennheiser HD800, HD600, HD580 and PX100 headphones. A...
  18. amb

    Roll Call: Who's building, built, or thinking of building a beta22?

    The signal won't be differential, but yes, any headphones already modified in this way will work, as long as the connector type and pin assignments are consistent.
  19. amb

    Roll Call: Who's building, built, or thinking of building a beta22?

    What jcx proposes is a standard two-channel passive-ground configuration, with an independent power supply for each channel. Also, rather than a standard TRS stereo phone jack (which has 3 conductors with a common ground), you use a different connector that lets you separate the left and right...
  20. amb

    Roll Call: Who's building, built, or thinking of building a beta22?

    The PCB dimensions are documented at the β22 and σ22 websites. You want to arrange the PCBs in the case for optimal signal routing, and place the power transformer as far away from the amp boards as possible. Once you establish the basic layout, then find a case that would fit. You could also go...
  21. amb

    CM6631A / USB Interface?

    Like this? ζ1 Audio Widget asynchronous USB-I²S module
  22. amb

    Need to build a Linear Regulated 24v Power Supply

    Yes, a 24V transformer will work, because after rectification, the voltage gets multiplied by a factor of 1.4142, enough to account for the regulator's voltage dropout and variations in line voltage. The transformer you linked is a EI core type, which emits strong magnetic fields in certain...