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Thread: The Bug is back

  1. #71
    Join Date: Mar 2017

    Location: Liverpool

    Posts: 766
    I'm Sandro.

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    I am using one meter to monitor the Off set
    Attachment 24414
    The other 2 meter measure the voltage drop on the 0.5 Homes source resistors
    Attachment 24413
    I am also using a timer to keep track of things
    and a 4 Homes load

    Attachment 24415
    I am letting things get nice and warm before stepping up the bias
    So far I have not changed any thing from last week
    Things are really stable and I am going to be patient for an hour or so before I take it up (sorry meant to say WE like in other forums)

  2. #72
    Join Date: Mar 2017

    Location: Liverpool

    Posts: 766
    I'm Sandro.

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    It has now been about 45 minutes

    The voltage drop on the bias resistors for Positive and negative rail (WE may do same meter swapping later as one cost 10 times the price of the other and more than my scope)

    DSCF2328.jpg

    Main thing is that the offset is dropping as things get warm (again meter swap later as this one was born in 1992)


    DSCF2329.jpg

    For now sinks at about 28 C (way to go so far) and the offset below the mV mark as it was last week

    Yes it is a very stable design whit out loads of components to keep thing stable and muddy up the sound

  3. #73
    Bigman80 Guest

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    Quote Originally Posted by Bksabath View Post
    Attachment 24361Attachment 24362Attachment 24363yes strange they only open if you click on them got 3 on this post
    Nice!!!!!!!!

  4. #74
    Join Date: Sep 2018

    Location: Liverpool

    Posts: 14
    I'm Paul.

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    Wow!!!! mate that looks FANTASTIC. I better get on with the front ends.

  5. #75
    Join Date: Mar 2017

    Location: Liverpool

    Posts: 766
    I'm Sandro.

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    Yes You better do.

    They are not going home whit out

    Plus can't wait to see same one face when he see that surprise finish

    BTW 350 mV do us a favour and read the manual bit about Bias whit sinks at 32 C one does not know when to stop …

  6. #76
    Join Date: Sep 2018

    Location: Liverpool

    Posts: 14
    I'm Paul.

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    quality and reliability over max power every time for me .

  7. #77
    Join Date: Mar 2017

    Location: Liverpool

    Posts: 766
    I'm Sandro.

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    funny You should say that



    I was testing things and must have slipped whit the volume I got smoke out of the final boards
    Must say it was not on any condition you are likely to see at home ever
    100 Khz whit a square wave volume unknown
    No big deal, my fault, it will get sorted no worries about that

  8. #78
    Join Date: Mar 2017

    Location: Liverpool

    Posts: 766
    I'm Sandro.

    Default

    Any way same pictures before the smoke
    this is getting to technical but other on this tread may appreciate and comment


    1KHz Probe test.jpg

    My scope is not that good one of the channels, top is pretty bad
    Bad scope .jpg

    You may notice the shape of the curve on top channel

    All the test have been taken whit a 4 homes load
    1KHz at 2.7 V RMS 1.jpg2.8 V RMS over 6 V Peak to Peak.jpg
    Attached Images Attached Images
    Last edited by Bksabath; 15-10-2018 at 20:45.

  9. #79
    Join Date: Mar 2017

    Location: Liverpool

    Posts: 766
    I'm Sandro.

    Default

    Start clipping 1.jpg
    Start clipping 2 .jpg

    Start clipping
    If you look at scope the 10 X switch multiplier is on the probe




    same square wave and such
    20 Vd 12.4 V RMS.jpg22 V RMS = 54 volts swing .jpg60 Khz meter limits .jpg

  10. #80
    Join Date: Mar 2017

    Location: Liverpool

    Posts: 766
    I'm Sandro.

    Default

    Attachment 24428Attachment 24429Attachment 24430

    It start loosing shape at 60KHz
    I was going to post same current results but I have blown up (not surprising) one of the Output boards


    So more to follow ...

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