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  1. Old Comment
    abraxalito's Avatar

    TL431 output filter for TDA1543 current source elimination

    Hi Jean

    How did you create your 3.2V virtual ground? And you still use the same I/V resistors?
    permalink
    Posted 8th May 2017 at 02:40 AM by abraxalito abraxalito is offline
  2. Old Comment

    TL431 output filter for TDA1543 current source elimination

    Hello Abraxalito,

    I have made a Dac using one TDA1543 (PSU 5V) and decided to try to unconnect Pin 7 and to feed the I/V resistors with a 3V2 virtual ground.

    Click the image to open in full size.

    However, it doesn't work !
    Well,it is working, but I get a very weak level.

    When I connect back a 890 Ohms resistor between pin 7 and ground and the I/V resistors back to ground, it works fine.

    What am I missing ????

    Thank you for your help here.
    Best regards,
    Jean
    permalink
    Posted 7th May 2017 at 02:04 PM by Bidule Bidule is offline
  3. Old Comment
    abraxalito's Avatar

    Tweeter passive XO based on a transformer

    Thanks for the feedback! From what I recall about autoformers, they save a lot of copper when the turns ratio is close to unity but have smaller and smaller advantages moving away from that. Here as I'm going for at least 2:1 and probably 3:1 the advantage is fairly small. But might be worth considering if they show improvements in leakage inductance.
    permalink
    Posted 4th May 2017 at 11:01 AM by abraxalito abraxalito is offline
  4. Old Comment

    Tweeter passive XO based on a transformer

    Well that is a different approach!

    I remember seeing auto transformers used in some old XO's. That is essentially what you are doing here but instead running the full power through the core.

    You might want to look at the auto transformers approach - less flux and likely less distortion as a consequence.

    Nice off the wall idea.
    permalink
    Posted 4th May 2017 at 03:28 AM by googlyone googlyone is offline
  5. Old Comment
    wintermute's Avatar

    Construction of a P2P LM3886 gainclone part 1.

    I missed this comment Andrew! Thanks it gave me a chuckle I'm not sure exactly what possesed me to make it so compact, probably just because I could!!

    I regret it a bit now as I would have liked to have tried it with a lower gain, but it is too difficult to do once it is built.

    It is still in service now as the mid/tweeter amp in my bi-amped setup with 10" woofers running off my playmaster series 200. One day I will get around to building my BA3 complementary which will take over from this and it will then be my speaker testing amp once again.

    Tony.
    permalink
    Posted 26th April 2017 at 01:44 PM by wintermute wintermute is offline
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