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  1. Old Comment

    spice models

    Password now needed for links.
    Posted 21st December 2014 at 04:02 PM by sbrads sbrads is offline
  2. Old Comment
    Posted 21st December 2014 at 01:56 AM by fas42 fas42 is offline
  3. Old Comment
    abraxalito's Avatar

    My latest infatuation - transformers

    I see the PSU lacuna rears its head once again over on Tom's thread (if that's not too mixed a metaphor). Reasonable questions about errors and oversights in Tom's "data driven" postings get the brush off once more
    Posted 21st December 2014 at 12:52 AM by abraxalito abraxalito is offline
  4. Old Comment
    fas42's Avatar

    2,000W into 1 ohm

    Looking nice ... how about 1.6kW into 2 ohms, at 200kHz, eh, ? Not interested in the distortion numbers, but rather whether the circuitry is behaving itself, operating correctly at these levels - and it does, the waveforms that matter all are very clean doing this sort of power.

    There is no point in having a real unit do this, the thermal issues are not worth the fuss needed - but it shows that the circuit has solid integrity in how it behaves - it has a very wide safety margin ....
    Posted 18th December 2014 at 11:12 PM by fas42 fas42 is offline
  5. Old Comment
    fas42's Avatar

    2,000W into 1 ohm

    Learning quite a bit from this exercise - at the moment tackling the dark underbellies of output stages ... as has been stated many times these are not straightforward, thermal and balancing issues are very much part of the "battle" to get the best from the circuit - again, I'm looking at making the circuit be well behaved at 200kHz, which then highlights where the weaknesses are; ensures the focus of optimising is directed into the right areas ...
    Posted 15th December 2014 at 10:00 PM by fas42 fas42 is offline
    Updated 15th December 2014 at 10:03 PM by fas42
  6. Old Comment
    fas42's Avatar

    2,000W into 1 ohm

    This sorta died, didn't it?! Trouble is, I run out of mental puff easily ... so, now I'm trying a new tack: taking an advanced design that's already out there, by someone else; diving into it and completely getting to grips with how it behaves; and then optimising it, and also extending its performance. I'm also feeling inspired at the moment to possibly design and produce PCBs for such - which will have a lot of my thinking and finessing incorporated.

    The aim, again, would be to have something that operates at a top level technical performance, and also delivers excellent sound - would there be any interest if I produced a few boards, etc?
    Posted 12th December 2014 at 09:42 PM by fas42 fas42 is offline
  7. Old Comment
    abraxalito's Avatar

    CD is better than vinyl, which is why vinyl sounds better than CD

    That plot of impulses (which looks to me like pure Sony propaganda) showed up on HeadFi too, and I commented on it there.
    Posted 30th November 2014 at 12:50 AM by abraxalito abraxalito is offline
  8. Old Comment
    fas42's Avatar

    CD is better than vinyl, which is why vinyl sounds better than CD

    Sorry, raul_77, that explanation is completely wrong; technically, 44.1 rate digital has no problems whatsoever. Its the execution that's the problem, the components you're using to playback the digital source have a distortion problem, irrespective of what the spec's or any normal measurements may say.

    Distortion?? Yes, that's the "not sounding natural" quality in the CD sound, it's distortion, pure and simple ... I can say this, because I got conventional CD to sound 100% natural 30 years ago, by "fixing up" the problems the replay system had - you then appreciate that often CD sound playback has added, "unnatural" distortion artifacts - which can always be eliminated by doing the right things ...

    Posted 29th November 2014 at 11:34 PM by fas42 fas42 is offline
  9. Old Comment
    wlowes's Avatar

    My Ref Music Server - Lampizator meets Red Baron

    world's slowest project still WIP. Red Baron has morphed into Ryanj Distinction TDA1541a board with Ian's I2S to PCM. I think it will finally play music shortly after xmas, now that I am back into it.
    Posted 29th November 2014 at 09:50 PM by wlowes wlowes is offline
  10. Old Comment

    CD is better than vinyl, which is why vinyl sounds better than CD

    Vinyl is better and sound better than CD:

    [If you go to a jazz club to hear Randy Crawford sing, then go home and play the CD it just doesn’t have the natural ebb and flow of the live show.
    In this respect, vinyl LPs do better.
    Sure, they have a multitude of other problems, but always seem to time more convincingly when played on a decent turntable. The reason for this, according to Chord Electronics designer Rob Watts, is that digital audio is fundamentally constrained by (what, if it were a television you’d call) its frame rate. Because it has a limited number of samples (‘frames’) per second, it can’t completely accurately resolve the ‘inter-aural’ timing of the music. Watts thinks this is a serious flaw, and the lower resolution the digital signal is (ie CDcompared to hi-res), the more acute the problem becomes.
    Rob says that – in simple terms – the brain samples sound in real time every 4 microseconds, whereas CD refreshes its ‘frames’every 22 microseconds. It’s CD’s inability to work as fast as the brain that causes its problems in the time domain, why it doesn’t sound natural.]

    And have more dinamic:

    Click the image to open in full size.
    Posted 28th November 2014 at 05:03 PM by raul_77 raul_77 is offline
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