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Chord Mojo DAC-amp ☆★►FAQ in 3rd post!◄★☆

Discussion in 'Portable Source Gear' started by Mython, Oct 14, 2015.
  1. x RELIC x Contributor

    Volume is digital. There is one discrete opamp for the critical I/V stage (you have to have this). That's it. Rob has said this from the beginning vs the 3-4 opamps in most other gear. Nothing has changed from Rob and Chord regarding this.
  2. Mython Contributor
    LOL - last night, I found out Mojo needs a new (non-Chord) PSU.
    Tonight, I find out Mojo needs a new (non-Chord) battery, too.
    Wow, what a badly-designed product it must be - it seems more than 30,000 people, and half the reviewers in the industry, are all deluded that Mojo is a well-designed high-quality product, with a ground-breaking price-performance ratio.
    Someone told me, last week, that they want to find an FPGA upgrade for Mojo  (not really, but my guess is it's only a matter of time before someone asks...) [​IMG]
    Traveller, Slaphead and x RELIC x like this.
  3. howdy
    Im not really Android savvy, so if i hook the Mojo to an Android should it just work or is there something in the settings to change? This is via mUSB
  4. warrior1975
    Jesus... All this craziness over a battery, that is under warranty for quite a bit of time, on a fairly inexpensive device. Just enjoy your Mojos. It's built to last. Trust in Chord.

    howdy Depends bro. In a perfect world, yes. Android can be a pain as there is little consistency between Android devices. Usb should work, but it can be effected by many things, in particular the music app.

    Also depends on the version of Android as it needs to be usb OTG. Newer software has settings built in, older doesn't always and you'll need a OTG cable. (on the go)
    canali likes this.
  5. Torq

    Since a debate is pointless (it won't change what you do/do not understand, nor will it alter the realities of existing battery technology and performance), I could explain how you can figure out at least the minimum* spec of the Mojo's battery (I'm assuming it is not just printed on the battery itself - but I've not looked myself).  That'll be a fairly long and involved, if not necessarily technically very complicated post, so I'm not going to do it "just because" so, for now, I'll leave it as a hint, a caution, a caveat and a rationale for that caveat ...
    Doing this will require an allen key, ruler, thermometer, a multi-meter, some low-impedance IEMs, a suitable charger (say, a 10w model for the iPad) and cable, a music source, possibly a large towel and a willingness to invalidate your warranty.
    It also comes with the potential of serious personal injury, even death, and the very real possibility of damaging or destroying the Mojo unit in question.
    I'm not being facetious about what you need, or the risks involved.  There's no magic or secret involved.  Just some very basic electronics knowledge, a bit of deduction*, and some fundamental reverse engineering techniques.  It won't be a very accurate result, and at best can give you the minimum* spec; to do better requires much more involved processes, techniques, knowledge and equipment and testing to destruction in a number of different ways (e.g. thermal, current and voltage overloads for a start).
    (*This can only yield the minimum spec, since we have to use some information provided by Chord earlier in the thread which we don't know the tolerances around, then there are losses in the measurement processes, and finally we have to assume things are not being run at the limits of their capabilities in order to provide a safety margin.  For example Chord has stated, in this thread, that the battery is safe to 160 degrees C - and we know they're limiting thermal excursion to FAR below that ... because if they weren't they'd be getting sued for all the burns and scalding the unit caused).
  6. howdy
    I got a new cheap Samsung Galaxy J1 it has the newest version on there, maybe ill have to try another cable.
  7. Traveller
    Arpiben likes this.
  8. Mython Contributor
    Make sure the cable is an OTG one, and make sure the OTG end is plugged into the phone.
    And there are a few other tips in post #3.
    Let us know how you get on [​IMG]
  9. Arpiben
    Doing this will require an allen key, r
    Allen key and then "Torq/Torx" key for FPGA...:smirk:

  10. Arpiben

    Human being nature. Always want more, never happy.
    By the way some similitudes with our gear addiction. ☺
  11. SearchOfSub
    For me I don't think I'll be ever be happy after a short while with audio. I'll call it a day when I am "satisfied" (with continued usage) with what I am hearing and call it as being "happiness" with sound. :D
  12. Zachik
    Can you provide a link?  I could not find anything online...
  13. rkt31
    frankly speaking i don't care for any other thing than the sound quality at this price. but that does not mean mojo in anyway is poorly designed. in fact it is a revolutionary product in many ways. apart from sound, it  scores in  design, portability , ease of use and simplicity . it is being used by many in full systems. kef in one high end show used mojo as source for their blade speakers. the entire set up was worth many thousands $. chord said correctly that they could have sold  the mojo tech for a lot more by encasing it in a big box. so the best part of mojo is the versatility. in fact i would say it is the other way, it is a full fledged dac with very high quality preamp and headphone drive actually is a bonus due to its small size and extremely low output impedance . :)
  14. audi0nick128

    Speaking about this, did you already test if Mojo works with an USB 1 connection?
    I was thinking that maybe a working USB 1 connection could be beneficial, since the slower speed results in less mistakes during the delicate USB audio transport. And since the the speed should be sufficient for Redbook quality it might be a nice tweak... I am possibly wrong, though :wink:

  15. Arpiben

    Didn't find yet a USB1.x device around me.
    Regarding the eventual benefits, since I am not in computer design I have no idea. even if doubting.
    Hereunder an abstract of a previous post answer I wrote.
    A few days ago I promised to try( for my own knowledge) Mojo's with an old USB1.x laptop.
    I did the trial with an old Toshiba Sattelite SM-30 104 running Windows XP Family SP3 (2004)
    Unfortunately all USB ports were USB2.0. Nonetheless I managed installing Chord drivers as well as playing some tracks.
    With such hardware/software configuration it is not suited for digital audio (96kHz not playing/44Khz bringing errors with player used)
    N.B. The USB1.x check is not on top of my priority list during my free time.Easy and fast to do if equipment available 
    Cheers [​IMG] 

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