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congo5

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Posts posted by congo5

  3. goldenreference low voltage power supply

    in Do It Yourself

    Posted · Edited by congo5

    transformer input vac? blue to pink, and each to green? (center three)

    brown trace connects though via on right bridge footprint?

     

    bridge.jpg

    7 hours ago, gepardcv said:

    In which case I guess I should just jumper those two points?

    Lets find out where the break is first.

    is it just the via? that is easy to fix.

  4. goldenreference low voltage power supply

    in Do It Yourself

    Posted

    just stating fact, the best I know, not to infer anything:mellow:

    there should be continuity between collector and pin of bridge closest to input connector

    and second pin of rectifier to transformer input

    a dead short like a bad cap would make the transformer unhappy, buzz and hot. I assume that isn't the case.

    usually its a very simple cause, but hard enough when its in front of you to find.

    I have one that is a bit noisy, like 5v of ripple at 80hz, I did the layout so you know where the problem stems from.

     

  9. KGSSHV Carbon Build Thread

    in Do It Yourself

    Posted · Edited by congo5

    On 8/9/2016 at 4:13 PM, kevin gilmore said:

     

    http://gilmore.chem.northwestern.edu/kgsshvcarbonpsleft.jpg

    http://gilmore.chem.northwestern.edu/kgsshvcarbonpsright.jpg

    older power supply schematic without the on/off switch

    http://gilmore.chem.northwestern.edu/goldenreferencehvsic.pdf

     

     

    you can use that schematic and figure out the extra three parts now I see its been added,

    BOM is harder, write down the silk screen and look it up or wait for Kerry.

    Haven't seen any build this but Him

  13. Balanced to unbalanced board

    in Do It Yourself

    Posted · Edited by congo5
    change schematic

     Kevin's SMD layout, adapted a bit for my methods

                                                                                                                   Servo's work

    Clipboard02.jpg

    155587.jpg 

     

                                                             and a  plug in buffer with 1W MPSW transistors (for Turbo)

    diamuff4.jpg

    IMG_20170223_153647928_HDR.jpg

    It seems that I like buffers............

  14. The Multi Amp aka Dynalo Mk2

    in Do It Yourself

    Posted

    Here are the original ones from Kerry, don't think he will mind..

    https://drive.google.com/open?id=0BwUlR99qUHFqY1YxRjFfcnA1X1k

    1 hour ago, johnwmclean said:

    nice work, impressive soldering.

    Well that was after several hours of trial and error, next time I should just order the prebuilt ones.

    Kerry thanks for the beautiful layout, files, schematics and advice.

    This was quite different from the norm,  a nice adventure.

    • Like 1

  15. The Multi Amp aka Dynalo Mk2

    in Do It Yourself

    Posted

    here is a dxf file that is modified, https://drive.google.com/open?id=0BwUlR99qUHFqQnVZcGkzMjBva3c

    I enlarged it .250" to allow for 1/4" square stock to use as a frame

    and made other minor changes, its not perfect yet but getting close.

    RCA hole size increased to fit the lip around them.

    the IEC corners have been rounded more but haven't tested that

    also want a round button instead of the square one

     test pieces out of PCB

    IMG_20170206_222324057.jpg

    bck-38_HDR.jpg

     

    2381_HDR.jpg

    and yes I cheated on the trimpots

    and I find these very hard to solder:

    88097.jpg

    • Like 9

  17. Balanced to unbalanced board

    in Do It Yourself

    Posted

    Messing with this tonight.

    IMG_20170211_224441189.jpg

    Its playing into balanced ortho's. the gain is stock at 2 and its just enough, not real loud but sounds just great!

    yes this is meant for Pre duty, this is one way I test them.

    that 12va transformer is too small, but was just sitting here. 20-25va would be better.

    GRLV is set for +-18V heat sinks are 35C,  with 4V of regulation

    the buffer's are setup for 18v & that way I can use the cheaper servo's

    room is 20C, buffer output transistors are 40-46C, transformer 42C

     

    • Like 7

  20. The Multi Amp aka Dynalo Mk2

    in Do It Yourself

    Posted

    8 minutes ago, HemiSam said:

     Might have to spoil myself with one of those.

    Yes, want! don't have small pencil

    on Flux: its a big deal, what he has is way better, the kester boils off quick and leave's more residue but works

    I got the positive regulator on the first try, but took three times on the negative   Had too much solder under and some side pins would not make contact.

    flux dries> solder won't stick> start over

    going slow and careful as I only have one board, that took half a day ;-)

    Really want the microscope + camera.

    • Like 2

  21. The Multi Amp aka Dynalo Mk2

    in Do It Yourself

    Posted

    under video description click "show more"


    ✖ TOOLS USED:
    ● Flux: http://bit.ly/2cYIx7t
    ● Solder paste: http://bit.ly/2epK1JE
    ● Soldering Iron: http://amzn.to/2cKkMyO
    ● Preferred tip: http://amzn.to/2d5MgPn
    ● Micro Soldering Pencil: http://amzn.to/2d5MWUP
    ● Micro soldering tip: http://amzn.to/2eYrF4a
    ● Hot Air station: http://amzn.to/2d5M7Lw
    ● Hot Air EXPENSIVE: http://amzn.to/2cYI6tY
    ● Tweezers: http://amzn.to/2d5NBpi
    ● Multimeter: http://amzn.to/2cYJY5T
    ● Multimeter Probes: http://amzn.to/2cKkvMh
    ● Fume Extractor: http://amzn.to/2d5MGoD
    ● Microscope: http://amzn.to/2iLrE16
    ● Microscope LED light: http://amzn.to/2d5Mh5T
    ● Solder: http://amzn.to/2cKkxUp
    ● Crest CP500HT Ultrasonic cleaner: http://bit.ly/2iv3aci
    ● Branson EC cleaning fluid: http://amzn.to/2cKlBrp
    ● Jumper wire THIN: http://amzn.to/2eqF5T7
    ● Jumper wire THICK: http://amzn.to/2eAJ5AU
    ● Nitrile gloves: http://amzn.to/2iUfumS
    Bench PSU: Agilent 6542

    I'm using Kester.

    turn down the blow.

    hold with twezers

    mask off  blow zone with aluminum foil?

    • Like 2

  24. Technical Assistance/Advice Thread

    in Do It Yourself

    Posted · Edited by congo5

    yes 3.3nf  

      Safety Ceramic Disc Capacitors 

    I think he may be doing it different ways to show possibility's, both are valid, notice a different thermistor is used

    there are other designs shown in the other amp guides, different ways to do the same thing, different ground loop breakers.. and so on.


     
    		 

    notice how he does the secondary connections to bridges, completely different

    one center taped, one normal  but really its the same result, isn't it?

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