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MDAC First Listen (part 00111011)

Discussion in 'audio' started by fred sonnen, Mar 11, 2019.

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  1. clivem2

    clivem2 pfm Member

    I'm only in for 50 quid for Detox so I can live with the pain. Had I put money in for DAC and VFETs I'd be royally pissed. The generous person in me hopes that John had all the best intentions at the outset but when so much money rolled in and timing went awry there was no way back.

    Paying back tens of thousands of pounds would be tough. Putting something out as diy would help but maybe it's only viable for Detox, though there's less interest or importance attached to Detox.
  2. John_73

    John_73 pfm Member

    I’ve been periodically watching this 6 year (!) saga from the sidelines, and just find the whole thing astonishing. Has John ever offered up so much as an apology for all the delays incurred etc?
  3. clivem2

    clivem2 pfm Member

    In the end it's turned out to be a way to subsidise his development of commercial projects. Whether it started out that way is largely irrelevant now.

    Here's an idea...maybe he could get his commercial projects offered to his PFM funders at trade price.
  4. Stunsworth

    Stunsworth pfm Member

    That’s what the MDAC 2 is meant to be, a replacement board and/or front panel.
  5. russel

    russel ./_dazed_and_confused

    I was going to do “Downfall” but I was a bit tired, maybe at the weekend, not like there is a lack of material...
  6. Stunsworth

    Stunsworth pfm Member

    In the end I bought one of those - Project S2 Pre.
  7. Sibbers

    Sibbers pfm Member

    I'm not interested in asking for any money back nor trying to sell anything on, but I would like for updates and responses to reasonable questions to take place, especially given the awkward position it puts Tony in for trying to help John operate on his forum. Taking any emotions out of the whole thing, knowing what is true would be my preference even if that means these, or some of these projects are dead. If there really is meaningful progress then, well that would be a pleasant but unexpected surprise from my perspective.
    John_73 and wintoid like this.
  8. brab

    brab pfm Member

    I suggested this here a while ago. John didn't respond, and funders didn't seem interested.
  9. Rosewind

    Rosewind Lost in Translation

    To pay trade prices for products while John is sitting on my 3000£ would certainly add insult to injury.

    Again, I would settle for a DIY project with the boards tested and assembled by John and a refund that would cover the cost of having a professional build the VFETS.

    But how on earth are we going to get John to build working prototypes of the MDAC2/FDAC/VFETs when he hasn't come up with much in way of concrete builds in the past 6 years?
  10. killie99

    killie99 pfm Member

    We've had 6 years of countless changes all of which has led to broken promise after broken promise after broken promise .... ad nauseam. I don't have the time or inclination to sift through 6 years worth of posts to find out how many times we've been told it'll ship in 'x months', must be in double figures.

    Rosewind, I don't know how you are so calm. I'm in for £450, if I was in for £3k I'd be on a flight to the Czech republic and banging on his door.
    Wilson and John_73 like this.
  11. JohnW

    JohnW pfm member


    An off the shelf chassis would really easy the VFET situation, however we need to design the boards so could be translated to the full fat chassis.

    The working plan is :-




    We are currently testing various PCB sections for MDAC1.5/MDAC2 (such as modulator boards etc). MDAC1.5 will be ready with 4 months, First MDAC2 boards end of the year.

    To convince the metal work vendor to manufacture the front and rear panels for MDAC2 we had to design a small DAC, so there will be a affordable "commercial" discrete DAC / MQA etc (think around GBP400 pricing point) - however I expect MDAC1.5 will be shipping before as we can move faster with in house SMD etc and we 100% reuse the MDAC chassis (no new metalwork).

    I suspect I'll be able to arrange a discount pricing for this commercial design for those who have sponsored the MDAC2 / FDAC etc. But really, the MDAC1.5 will be shipping before then and is a higher quality design.

    PCB should arrive tomorrow for DevDAC II which will morph into the MDAC1.5 after testing / on the next PCB spin.

    MDAC1.5 / MDAC2 use the same modulator options, so modulator boards for MDAC1.5 will work with MDAC2.0

    Once MDAC1.5 / 2.0 are completed then we work on VFET's, once VFET's are out of the way then we look at FDAC.
  12. evand

    evand pfm Member

    Isn’t it high time you guys got together and filed fraud and theft charges and be done with it?
    John_73 likes this.
  13. evand

    evand pfm Member

    No, I've just followed this thread with morbid fascination since signing up on pfm a few years back. I cannot fathom how this situation has been tolerated and allowed to run this long by those who have thrown money to the wind. To refer to it as an investment is frankly laughable, it's a donation at best.
  14. Coll

    Coll pfm Member

    I paid £500 for FDAC which I no longer require.
    Does that mean that I will now lose that if it does mean that then I am paying towards someone else's equipment.
  15. Stunsworth

    Stunsworth pfm Member

    You can either wait for the FDAC or put the money towards the MDAC 2 - which is what I'm planning to do.
    Rosewind likes this.
  16. JohnW

    JohnW pfm member

    The number of MDAC2's (FDAC) built is limited to the number of sponsors. When the design is ready for production then you will be able to sell you sponsor ship position to a 3rd party if there is interest (I suspect there will be).
  17. chass

    chass New Member

    First of all - apologies for 'hijacking' this thread; but it seemed the most relevant - i will keep it brief:
    I have a ~7 year old (from new) M-DAC (not been used that often) which has now failed with the 'no comms' message. I checked inside and the mainboard to front panel connector is ok. However, i noticed several bulging capacitors. I will borrow a scope and check the Xtal clock frequency tomorrow, but i did notice the 3v3 line seems to be around 2v5 ?!
    I am a digital (comms) engineer but no expert on analogue. However, i wondered if someone on here could perhaps give me a steer please like: 'fix the caps and that would account for the problem' or for example, I have seen comments around a faulty crystal causing this problem elsewhere on google; so could it be that ?
    Any help (very) gratefully received.

    Many Thanks
    - Charlie
  18. killie99

    killie99 pfm Member

    Replace all the bulging caps, including any on the AC board which are bulging and then see how it is. This is a well documented problem.
  19. JohnW

    JohnW pfm member

    The Clock VDD should be 3.3V, so I'd first start by replacing the caps.... (the standard electrolytics) - not the silver bodied Lelon Organic caps (Todate I've never seen a bad Organic cap).
  20. jamjar784

    jamjar784 Heavy Up

    A few people have managed it but it's not an easy solder job. You need good eyesight and powerful iron. Maybe they'll chip in here .. sam_cat et al??? Or you can search this humungous thread :(
    russel likes this.
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