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  1. Old Comment
    abraxalito's Avatar

    High-end chipamp build project

    Yes indeed, so much so that although I'm a digital music fan I don't use a computer to play my music. At least not a normal desktop - I'll either use a DVD player or a media player (on a TF card) I got from Taobao. The latter uses a Cortex M4 CPU so its a computer of sorts, a low power SoC.
    Posted 13th January 2016 at 03:15 PM by abraxalito abraxalito is offline
  2. Old Comment

    High-end chipamp build project

    right ok
    looks like i need to try both single and paralleled then
    thx for the method
    shall report back when i get it tested

    i have been using these batteries as capacitors with floating "run of the mill" regulated linear supplies to provide ps unobstructedly direct from the cells and in same manner as a voltage ref in soekris r2r dac

    started out with desktop type computer audio ps mods and it looks like the disease is going to spread to everything from the wall socket to the speakers

    so far it seems easier to get sq increase out of the computer mods than anywhere else in a digital audio setup
    computers are a bit of an audio hell hole
    i suppose everything can be improved
    Posted 13th January 2016 at 12:00 PM by nige2000 nige2000 is offline
  3. Old Comment
    abraxalito's Avatar

    High-end chipamp build project

    Interesting question - thanks. You can combine the outputs using capacitors (with a little bit of series R, say 0.22ohms). The capacitors are needed because the DC offset at the outputs can be rather high. I've done this on my TDA1521 amps (another blog post) and it worked fine. The 1521 needs this because its max current rating is rather low (2.2A) but for the TDA8566 this could never be an issue as its way higher.

    So the advantage of paralleling would be to halve the supply impedance between the pins and the die inside. I have no idea what this impedance is but it could be significant. Having one channel unused means the external power supply is less stressed, also could give definite advantages. But you'll have twice the quiescent current - you can't shut down one channel independent of the other.

    Batteries are a good option - aren't you the nige who's been using batteries on his DAC supplies and references?

    I've made some more discoveries since posting this project - nowadays I'd use an input transformer to reduce the overall gain of the amp with the aim of increasing the input impedance. The 25kohm min spec is just too low, I like to aim for over 200kohm nowadays and this can be done with a step-down trafo at the input.
    Posted 13th January 2016 at 02:03 AM by abraxalito abraxalito is offline
  4. Old Comment

    High-end chipamp build project

    what would be the consequences of bridging the inputs and outputs for mono?
    or just have one channel unused?

    in the context of been lifepo4 battery powered and been built in to a full range driver speaker cabinet

    ive a lm1875 that showed some promise with very early testing but will need a lot of 3.3v cells and just gets more complicated and costly

    thought it would be interesting comparison to the 8561q as it would be a much simpler option if its of comparable quality



    thx for posting your projects
    Posted 12th January 2016 at 03:16 PM by nige2000 nige2000 is offline
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