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Thread: New Tube DAC TDA 1543

  1. #11
    Join Date: May 2018

    Location: Woking

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    I'm Chris.

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    Actually I guess that one would be described as in 'series'.

    Here is a 'parallel' example.

    System 1: - Amp - Musical Paradise MP-701 - Neurochrome 686
    - Source: Linn LP12 (AT-OC9XEN) - D-Klimo LAR copy - Novafidelity X12 - Soncoz SGD1 -
    - Speakers: Cambridge Acoustic "Grand Master Evolution" - (Quads are in repair!) Subs: - REL T3's -

    System 2 - Amp: Musical Paradise MP 303 - Custom Pre -
    - Source: Audio Technica LP5 - EAR834p clone - Pioneer N-30K - Topping E30 -
    - Speakers: Loth X BS1's - Sub: REL T3 -

  2. #12
    Join Date: Apr 2012

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    I'm Geoff.

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    Gives a whole new meaning to 'a portion of chips'!
    Repeat after me 'I must not look on ebay! I must not look on ebay! I must not look on ebay! I must not look on ebay!

  3. #13
    Join Date: Jan 2009

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    I'm openingabottleofwine.

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    Ah - I understand now. Not heard of that technique for complete ICs, but it is commonly used with transistors (and even valves) to reduce thermal noise.

    The noise is reduced by the square root of the number of devices in parallel, so for 8 of them the noise will be reduced by a factor of 2.83 (or 9dB). There is no advantage in using more than 8, as the increase in the Miller capacitance will start to be a problem.
    Barry

  4. #14
    Join Date: May 2018

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    I'm Chris.

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    Quote Originally Posted by Barry View Post
    Ah - I understand now. Not heard of that technique for complete ICs, but it is commonly used with transistors (and even valves) to reduce thermal noise.

    The noise is reduced by the square root of the number of devices in parallel, so for 8 of them the noise will be reduced by a factor of 2.83 (or 9dB). There is no advantage in using more than 8, as the increase in the Miller capacitance will start to be a problem.
    Makes sense, there are some advertising the use of 16 but seems the point of diminishing returns has been well reached.

    Do you think the transformers will be able to handle the extra load?

    I think I might order 8 just to give it a go, then if I mess it up or it doesn't work I can just put the X 1 back in (assuming it's not going to damage anything within the circuit path). I would assume we're not talking voltages that are likely to do damage to any components downstream?
    System 1: - Amp - Musical Paradise MP-701 - Neurochrome 686
    - Source: Linn LP12 (AT-OC9XEN) - D-Klimo LAR copy - Novafidelity X12 - Soncoz SGD1 -
    - Speakers: Cambridge Acoustic "Grand Master Evolution" - (Quads are in repair!) Subs: - REL T3's -

    System 2 - Amp: Musical Paradise MP 303 - Custom Pre -
    - Source: Audio Technica LP5 - EAR834p clone - Pioneer N-30K - Topping E30 -
    - Speakers: Loth X BS1's - Sub: REL T3 -

  5. #15
    Join Date: Jan 2009

    Location: Essex

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    I'm openingabottleofwine.

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    You would have to look at the specification for the chip to see what the current consumption is. Then multiply that figure by the number of chips to see if it lays well within the current capability of the transformers (and of the voltage regulation circuitry).
    Barry

  6. #16
    Join Date: May 2018

    Location: Woking

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    I'm Chris.

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    Quote Originally Posted by Barry View Post
    You would have to look at the specification for the chip to see what the current consumption is. Then multiply that figure by the number of chips to see if it lays well within the current capability of the transformers (and of the voltage regulation circuitry).
    Thanks Barry, some DIY research coming on I feel.
    System 1: - Amp - Musical Paradise MP-701 - Neurochrome 686
    - Source: Linn LP12 (AT-OC9XEN) - D-Klimo LAR copy - Novafidelity X12 - Soncoz SGD1 -
    - Speakers: Cambridge Acoustic "Grand Master Evolution" - (Quads are in repair!) Subs: - REL T3's -

    System 2 - Amp: Musical Paradise MP 303 - Custom Pre -
    - Source: Audio Technica LP5 - EAR834p clone - Pioneer N-30K - Topping E30 -
    - Speakers: Loth X BS1's - Sub: REL T3 -

  7. #17
    Join Date: May 2011

    Location: Glasgow

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    I'm Brian.

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    Quote Originally Posted by Opti-cal View Post
    PM'd you Brian.

    Still enjoy my LP5 practically everyday!

    Mine now wears a cork mat, seems to work better in my system.

    Cheers
    Thanks Chris, replied. Yup, still enjoying the LP5x very much. I have a cork mat here and will give it a go. Thanks for the links etc.
    Regards
    Brian

    Sell your cleverness and buy bewilderment . (Rumi )


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  8. #18
    Join Date: Oct 2012

    Location: The Black Country

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    I'm Alan.

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    TDA1543 typical current consumption is 50mA.

    So you need to assess or test that the 5V supply can provide 400mA.
    I love Hendrix for so many reasons. He was so much more than just a blues guitarist - he played damn well any kind of guitar he wanted. In fact I'm not sure if he even played the guitar - he played music. - Stevie Ray Vaughan

  9. #19
    Join Date: May 2018

    Location: Woking

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    I'm Chris.

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    Quote Originally Posted by Firebottle View Post
    TDA1543 typical current consumption is 50mA.

    So you need to assess or test that the 5V supply can provide 400mA.
    Thanks Alan, the supply is 9V (9v/115v X 2) I believe and a lot of people have had success using 7/8v supplies. It has a Secondary Current rating of 833mA so even split between the two outputs it should meet the specs. Is that right? I've literally just guessed at most of that?!

    As it happens there is a school of thought that just having 1 chip gives a purer 'sound' (which does make sense) but if there is space in the unit I think I might still give it a try as it's cheap to find out.
    System 1: - Amp - Musical Paradise MP-701 - Neurochrome 686
    - Source: Linn LP12 (AT-OC9XEN) - D-Klimo LAR copy - Novafidelity X12 - Soncoz SGD1 -
    - Speakers: Cambridge Acoustic "Grand Master Evolution" - (Quads are in repair!) Subs: - REL T3's -

    System 2 - Amp: Musical Paradise MP 303 - Custom Pre -
    - Source: Audio Technica LP5 - EAR834p clone - Pioneer N-30K - Topping E30 -
    - Speakers: Loth X BS1's - Sub: REL T3 -

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