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Sebtdi

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  5. KGSSHV Carbon Build Thread

    in Do It Yourself

  8. KGSSHV Carbon Build Thread

    in Do It Yourself

    Posted

    24 minutes ago, johnwmclean said:

    Very nice build, any reason you couldn’t have used one custom transformer?

    Thank you! 

    That's a good point - I really like Antek products and they don't have any 350V with 15V secondaries. Perhaps a custom-made one - did not bothered to look elsewhere.

  9. KGSSHV Carbon Build Thread

    in Do It Yourself

    Posted

     

    Hello all,

    Carbon finally done, tested and buttoned-up - sounds great and very quiet. This was indeed a fun & satisfying project.  I would like to specially thank the following members for all their generous assistance with this challenging build (my first high voltage electrostatic amplifier) Kerry, sweetleaf, mwl168, jamesmking and JoaMat

    never worked with SMD's before and needed A LOT of help to debug & trouble shoot issues with the GRHV/LV power supplies, and could not have gone that far without tapping from your guys invaluable experience and know-how. There is only so much one can find inside the forums without getting lost. Thank you for all your patience with my million newbie questions and guiding me in the right direction. I learned a lot from this project and built some additional confidence for the next one.

    https://drive.google.com/file/d/1FkZ7RoqedCKawiJt-7tgDJJX6AZyXC9Q/view?usp=sharing

    https://drive.google.com/file/d/18HvzLtLvBteYe1kmUapJWf5N8k0qjX_m/view?usp=sharing

    https://drive.google.com/file/d/1BstEhS5A36FX8IedeIkk08jyVrDj30ld/view?usp=sharing

    https://drive.google.com/file/d/1iJm0reOXiFpjoqV2hYRZgmjf5-uaMpIn/view?usp=sharing

    Please let me know if there are a few tweaks that I can do to improve the layout, tried my best to keep it compact in a 2U chassis while separating the power supplies, wiring from the signal to lower noise, etc.. I welcome criticism, every experience is a lessons-learned.

     

    • Like 6

  13. goldenreference high voltage power supply (GRHV)

    in Do It Yourself

    Posted

    8 hours ago, Sebtdi said:

    Hello Folks

    Finished the power supply section this weekend. Question from a newbie perspective:  looking for instructions how to adjust/test for the High Bias voltage before installing the new Carbon boards.. R21-50K ?

    This is for a Golden Reference LH+LV Version 2.0 

    Readings:

    Bias H to ground = 436 V

    U7 Current regulator pad IXCY10M90S (right of R21) to ground = 650 V

    B+ = 418.5 V

    B- = -417.6 V

     

     

    566505910_IMG_3242(2).jpg.fcb4bf3424daa6a1c19ebc81f7dbe14d.jpg

    Thank you

    I was able to replace a Zener diode to 100V instead of 130V - now have 580V bias supply

    Thanks to Kerry for his assistance!

  14. goldenreference high voltage power supply (GRHV)

    in Do It Yourself

    Posted

    Hello Folks

    Finished the power supply section this weekend. Question from a newbie perspective:  looking for instructions how to adjust/test for the High Bias voltage before installing the new Carbon boards.. R21-50K ?

    This is for a Golden Reference LH+LV Version 2.0 

    Readings:

    Bias H to ground = 436 V

    U7 Current regulator pad IXCY10M90S (right of R21) to ground = 650 V

    B+ = 418.5 V

    B- = -417.6 V

     

     

    566505910_IMG_3242(2).jpg.fcb4bf3424daa6a1c19ebc81f7dbe14d.jpg

    Thank you

  19. goldenreference high voltage power supply (GRHV)

    in Do It Yourself

    Posted

    On 2/24/2021 at 10:57 AM, Blueman2 said:

    I applaud this thread!!! 

    On point 1 that James made, I am very guilty of helping cause this issue.  I have mixed comments on the GRHV across threads for Blue Hawaii BJT, Carbon, and a few others as well.  Just to make sure that it is almost impossible for anyone to learn from what I did.  😁

    On point 2, I have tested 2 alternatives to the C2M1000170D, and both appear to work fine.  One of them is pretty new and usually in stock:

    https://www.mouser.com/ProductDetail/?qs=vHuUswq2%2Bsy%2BS7yfkaWaCA%3D%3D

    Item on left is the one that is in stock.  Item to the right is the alternative that I successfully used as well, but often not in stock.  Middle is the standard part which appears to be quite elusive.  

    alternative.thumb.JPG.6de5ef6403db5df88f6f706fb603e456.JPG

     

    Has anyone tried the newer UnitedSIC yet for the GRHV78/79 regulator build in lieu of the Cree  C2M1000170D? They are still out of stock until end of June..🥵

    Another option that I have found somewhere on the forum is FQPF8N80C. Anyone tried them?

    https://www.digikey.ca/en/products/detail/on-semiconductor/FQPF8N80C/1056533

     

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