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  1. Old Comment

    Revisiting mods to the Lite DAC-AH

    I really want to try your ozone dac, I really interest with it, I already found source TDA1387 here but I didn't find any source good inductor here such as fastron inductor.

    if didn't found a big inductor like 27mh can I just use 1 mh and with resistor ?
    permalink
    Posted 13th January 2015 at 08:30 AM by oxoxbyx oxoxbyx is offline
  2. Old Comment
    abraxalito's Avatar

    Revisiting mods to the Lite DAC-AH

    Its just a minor redesign of the filter I worked out for the Aune. The difference is the 160ohm working impedance which I chose to give the highest output level from the 8 paralleled TDA1543s.
    Yes you could use it with the TDA1387 but the output level will be rather low due to the 160R impedance. I'd recommend for a single TDA1387 using Fastron inductors (27mH) - that gives a much higher output level. You'll see in an earlier blog post I had a filter designed using Fastrons.
    If you need more help, just ask - glad to work on any new filter specification you might have.
    permalink
    Posted 13th January 2015 at 07:14 AM by abraxalito abraxalito is offline
    Updated 13th January 2015 at 07:19 AM by abraxalito (Corrected inductor value)
  3. Old Comment

    Revisiting mods to the Lite DAC-AH

    abraxalito this is the lastest design your filter ? this filter can use in TDA1387 also ?
    permalink
    Posted 13th January 2015 at 05:33 AM by oxoxbyx oxoxbyx is offline
  4. Old Comment
    abraxalito's Avatar

    Revisiting mods to the Lite DAC-AH

    You're right about the DAC chip, that's TDA1543 (there are 8 of them in parallel), but the I/V is passive then the AD847 is used as an amplifier. So I plan to put the filter after the passive I/V and before the amplifier.
    permalink
    Posted 12th January 2015 at 11:49 PM by abraxalito abraxalito is offline
  5. Old Comment

    Revisiting mods to the Lite DAC-AH

    DAC-AH is DAC based with TDA1543 and it's dac with active I/V AD847 ?

    is mean from the disscusion before passive filter can improving sound of the dac is it ?
    permalink
    Posted 12th January 2015 at 08:40 PM by oxoxbyx oxoxbyx is offline
  6. Old Comment
    abraxalito's Avatar

    New year, new DAC

    An easy life would be a boring one.... challenges are what I enjoy
    permalink
    Posted 10th January 2015 at 12:11 AM by abraxalito abraxalito is offline
  7. Old Comment
    fas42's Avatar

    New year, new DAC

    Nice going there, Richard - again, this is very typical of how the journey goes; one makes progress in one aspect, but seemingly lose in another area ... the bigger picture is that one is getting closer to the primary objective, the inherent sound of the recording, in various ways, but it is difficult keeping all the improvements in step - either, a method of moving forward has introduced a weakness in some aspect, or, the better reproduction has now shone a brighter light on some deeper issues, which now need to be addressed ...

    Life wasn't meant to be easy ...
    permalink
    Posted 9th January 2015 at 10:59 PM by fas42 fas42 is offline
    Updated 9th January 2015 at 11:03 PM by fas42
  8. Old Comment

    Rebuilding a Hafler DH200 Part 1

    Thank you as well. Anyone who spends the time to share knowledge in an organized way adds to the good karma in the world.
    permalink
    Posted 9th January 2015 at 01:49 AM by Halauhula Halauhula is offline
  9. Old Comment
    abraxalito's Avatar

    New year, new DAC

    Its not quite finished yet - I took a pic before all the caps were wired up. Then I got some new Jamicon caps which measure better than the bottom two tiers of black caps in the pic, so I've changed those. Hopefully today I'll get to listen....

    A prosperous and contented 2015 to you too....
    permalink
    Posted 2nd January 2015 at 12:31 AM by abraxalito abraxalito is offline
  10. Old Comment
    fas42's Avatar

    New year, new DAC

    So, how's the sound? Better, no real difference, ... ?

    Have a good one in 2015, ...
    permalink
    Posted 1st January 2015 at 11:00 PM by fas42 fas42 is offline
  11. Old Comment
    fas42's Avatar

    2,000W into 1 ohm

    Out of curiosity, and for those who like numbers, I just did a THD at 20kHz, 1.6kW into 2R with current config, using perfect voltage rails - pretty nice, no harmonic worse than 130dB or so down, means about 0.00003% THD - trick will be to convert that into something working in the real world, that loses as little of such competence as possible.
    permalink
    Posted 1st January 2015 at 06:50 AM by fas42 fas42 is offline
    Updated 1st January 2015 at 06:53 AM by fas42
  12. Old Comment
    fas42's Avatar

    2,000W into 1 ohm

    Been thrashing a bit with looking at the behaviour of multiple output devices in parallel - this uses MOSFETs so the usual means of bias current equalising won't work ... and there are a number of ways of dealing with this. Why I worry about this is that the competent behaviour will be compromised if the output devices are uneven in their current handling, so I'm looking at the "smartest" way of handling this in the real world.

    Anyway, at the moment I feel the best, but possibly interim solution - if this ends up being put out there - is providing matched output stage combinations of parts along with the PCB to ensure that a built unit will be up to scratch.
    permalink
    Posted 31st December 2014 at 03:08 AM by fas42 fas42 is offline
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