• unusual stackup

    From jlarkin@highlandsniptechnology.com@21:1/5 to All on Sun Jun 12 13:17:48 2022
    I want to do a 6-layer pcb like

    L1 1 oz copper
    4 mil fr4
    L2 2 oz copper
    4 mil fr4
    L3 2 oz copper
    50 mil fr4
    L4 2 oz copper
    4 mil fr4
    L5 2 oz copper
    4 mil fr4
    L6 1 oz copper

    Does that sound goofy? Or expensive?



    --

    Anybody can count to one.

    - Robert Widlar

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  • From John Miles, KE5FX@21:1/5 to jla...@highlandsniptechnology.com on Sun Jun 12 14:05:09 2022
    On Sunday, June 12, 2022 at 1:17:59 PM UTC-7, jla...@highlandsniptechnology.com wrote:
    Does that sound goofy? Or expensive?

    No problem doing up to 8 layers with WellPCB. They
    support up to 12 or so, but 8 is the most I've done.

    The stackup will be a little different. They use 0.5 oz Cu on the top and bottom and 1-oz on the inside layers by default.

    -- john, KE5FX

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  • From Anthony Stewart@21:1/5 to All on Sun Jun 12 14:29:30 2022
    On Sunday, 12 June 2022 at 17:05:13 UTC-4, John Miles, KE5FX wrote:
    On Sunday, June 12, 2022 at 1:17:59 PM UTC-7, jla...@highlandsniptechnology.com wrote:
    Does that sound goofy? Or expensive?
    No problem doing up to 8 layers with WellPCB. They
    support up to 12 or so, but 8 is the most I've done.


    The stackup will be a little different. They use 0.5 oz Cu on the top and bottom and 1-oz on the inside layers by default.

    -- john, KE5FX
    Yes it sounds as expensive as an 10 layer 1oz layup. In volume the cost comes down to total copper weight. Thermally it doesn't have any advantage. Better make sure it Cu balanced.

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  • From Lasse Langwadt Christensen@21:1/5 to All on Sun Jun 12 14:25:53 2022
    s√łndag den 12. juni 2022 kl. 23.05.13 UTC+2 skrev John Miles, KE5FX:
    On Sunday, June 12, 2022 at 1:17:59 PM UTC-7, jla...@highlandsniptechnology.com wrote:
    Does that sound goofy? Or expensive?
    No problem doing up to 8 layers with WellPCB. They
    support up to 12 or so, but 8 is the most I've done.

    The stackup will be a little different. They use 0.5 oz Cu on the top and bottom and 1-oz on the inside layers by default.

    sure about that? normally all layers start as 0.5oz and then the outer layers end up at 1 oz during plating of the vias

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  • From John Miles, KE5FX@21:1/5 to lang...@fonz.dk on Sun Jun 12 17:24:55 2022
    On Sunday, June 12, 2022 at 2:25:58 PM UTC-7, lang...@fonz.dk wrote:
    sure about that? normally all layers start as 0.5oz and then the outer layers end up at 1 oz during plating of the vias

    That's correct, they plate to 1 oz externally, as I understand it. But their stackup diagram specifies 0.5 oz as it's applied prior to additional plating. Seems like the most common default practice among different Chinese
    PCB houses.

    -- john, KE5FX

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  • From Martin Rid@21:1/5 to jlarkin@highlandsniptechnology.com on Mon Jun 13 13:51:35 2022
    jlarkin@highlandsniptechnology.com Wrote in message:r
    I want to do a 6-layer pcb likeL1 1 oz copper 4 mil fr4L2 2 oz copper 4 mil fr4L3 2 oz copper 50 mil fr4L4 2 oz copper 4 mil fr4L5 2 oz copper 4 mil fr4L6 1 oz copperDoes that sound goofy? Or expensive?-- Anybody can count to one.-
    Robert Widlar

    Should be fine , the only thing is maybe they would round to the
    nearest proper thickness based on availble prepreg thickness's.
    To some +-%. Which would meet your requirements.

    Cheers
    --


    ----Android NewsGroup Reader---- https://piaohong.s3-us-west-2.amazonaws.com/usenet/index.html

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  • From Joerg@21:1/5 to jlarkin@highlandsniptechnology.com on Mon Jun 13 12:46:16 2022
    On 6/12/22 1:17 PM, jlarkin@highlandsniptechnology.com wrote:
    I want to do a 6-layer pcb like

    L1 1 oz copper
    4 mil fr4
    L2 2 oz copper
    4 mil fr4
    L3 2 oz copper
    50 mil fr4
    L4 2 oz copper
    4 mil fr4
    L5 2 oz copper
    4 mil fr4
    L6 1 oz copper

    Does that sound goofy? Or expensive?


    Doesn't sound goofy. I have done 4oz copper.

    --
    Regards, Joerg

    http://www.analogconsultants.com/

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  • From Lasse Langwadt Christensen@21:1/5 to All on Mon Jun 13 13:31:19 2022
    mandag den 13. juni 2022 kl. 21.46.24 UTC+2 skrev Joerg:
    On 6/12/22 1:17 PM, jla...@highlandsniptechnology.com wrote:
    I want to do a 6-layer pcb like

    L1 1 oz copper
    4 mil fr4
    L2 2 oz copper
    4 mil fr4
    L3 2 oz copper
    50 mil fr4
    L4 2 oz copper
    4 mil fr4
    L5 2 oz copper
    4 mil fr4
    L6 1 oz copper

    Does that sound goofy? Or expensive?

    Doesn't sound goofy. I have done 4oz copper.

    sure, but the thick copper is usually on the outside layers done by plating together with the vias

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  • From Joerg@21:1/5 to Lasse Langwadt Christensen on Mon Jun 13 13:56:26 2022
    On 6/13/22 1:31 PM, Lasse Langwadt Christensen wrote:
    mandag den 13. juni 2022 kl. 21.46.24 UTC+2 skrev Joerg:
    On 6/12/22 1:17 PM, jla...@highlandsniptechnology.com wrote:
    I want to do a 6-layer pcb like

    L1 1 oz copper
    4 mil fr4
    L2 2 oz copper
    4 mil fr4
    L3 2 oz copper
    50 mil fr4
    L4 2 oz copper
    4 mil fr4
    L5 2 oz copper
    4 mil fr4
    L6 1 oz copper

    Does that sound goofy? Or expensive?

    Doesn't sound goofy. I have done 4oz copper.

    sure, but the thick copper is usually on the outside layers done by plating together with the vias


    Usually yes but sometimes it's needed inside for high current traces.

    --
    Regards, Joerg

    http://www.analogconsultants.com/

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  • From John Larkin@21:1/5 to martin_riddle@verison.net on Mon Jun 13 14:22:53 2022
    On Mon, 13 Jun 2022 13:51:35 -0400 (EDT), Martin Rid <martin_riddle@verison.net> wrote:

    jlarkin@highlandsniptechnology.com Wrote in message:r
    I want to do a 6-layer pcb likeL1 1 oz copper 4 mil fr4L2 2 oz copper 4 mil fr4L3 2 oz copper 50 mil fr4L4 2 oz copper 4 mil fr4L5 2 oz copper 4 mil fr4L6 1 oz copperDoes that sound goofy? Or expensive?-- Anybody can count to one.-
    Robert Widlar

    Should be fine , the only thing is maybe they would round to the
    nearest proper thickness based on availble prepreg thickness's.
    To some +-%. Which would meet your requirements.

    Cheers

    Right, I'll need tolerances. I want fat copper and thin FR4 to get
    good heat transfer between layers.

    I'll have 16 DPAK fets on a board, with power dissipation about 10
    watts per pair, 80 watts per board. I can via down to internal power
    pours which will conduct heat into the power planes, to insulate the
    fets but spread the heat laterally in the planes.

    I can use these cute little heat sinks, but I want to thermally couple
    each pair of fets so they can share their two heat sinks, when one fet
    in a pair dumps most of the heat.

    https://www.mouser.com/ProductDetail/Aavid/7106DG?qs=sGAEpiMZZMuIeULrOsCjAywa1%252BzMrg4lhtuOKZksa%2Fc%3D

    The goal is to have everything surface-mount, pick-and-place, no
    machining or hardware or silicone grease or such.

    --

    If a man will begin with certainties, he shall end with doubts,
    but if he will be content to begin with doubts he shall end in certainties. Francis Bacon

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  • From John Larkin@21:1/5 to All on Mon Jun 13 15:42:38 2022
    On Sun, 12 Jun 2022 13:17:48 -0700, jlarkin@highlandsniptechnology.com
    wrote:

    I want to do a 6-layer pcb like

    L1 1 oz copper
    4 mil fr4
    L2 2 oz copper
    4 mil fr4
    L3 2 oz copper
    50 mil fr4
    L4 2 oz copper
    4 mil fr4
    L5 2 oz copper
    4 mil fr4
    L6 1 oz copper

    Does that sound goofy? Or expensive?

    Cirexx says it's reasonable and standard material.

    It's going to be heavy.

    https://www.dropbox.com/s/21o5hf8cal7xz6k/plugin_module.jpg?raw=1

    --

    If a man will begin with certainties, he shall end with doubts,
    but if he will be content to begin with doubts he shall end in certainties. Francis Bacon

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Lasse Langwadt Christensen@21:1/5 to All on Mon Jun 13 15:57:25 2022
    tirsdag den 14. juni 2022 kl. 00.42.50 UTC+2 skrev John Larkin:
    On Sun, 12 Jun 2022 13:17:48 -0700, jla...@highlandsniptechnology.com
    wrote:
    I want to do a 6-layer pcb like

    L1 1 oz copper
    4 mil fr4
    L2 2 oz copper
    4 mil fr4
    L3 2 oz copper
    50 mil fr4
    L4 2 oz copper
    4 mil fr4
    L5 2 oz copper
    4 mil fr4
    L6 1 oz copper

    Does that sound goofy? Or expensive?
    Cirexx says it's reasonable and standard material.

    It's going to be heavy.

    https://www.dropbox.com/s/21o5hf8cal7xz6k/plugin_module.jpg?raw=1

    https://www.reddit.com/r/electronics/comments/5i9wxd/i_just_received_my_20_ounce_pcb_soldering_is/

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  • From John Larkin@21:1/5 to langwadt@fonz.dk on Mon Jun 13 16:48:25 2022
    On Mon, 13 Jun 2022 15:57:25 -0700 (PDT), Lasse Langwadt Christensen <langwadt@fonz.dk> wrote:

    tirsdag den 14. juni 2022 kl. 00.42.50 UTC+2 skrev John Larkin:
    On Sun, 12 Jun 2022 13:17:48 -0700, jla...@highlandsniptechnology.com
    wrote:
    I want to do a 6-layer pcb like

    L1 1 oz copper
    4 mil fr4
    L2 2 oz copper
    4 mil fr4
    L3 2 oz copper
    50 mil fr4
    L4 2 oz copper
    4 mil fr4
    L5 2 oz copper
    4 mil fr4
    L6 1 oz copper

    Does that sound goofy? Or expensive?
    Cirexx says it's reasonable and standard material.

    It's going to be heavy.

    https://www.dropbox.com/s/21o5hf8cal7xz6k/plugin_module.jpg?raw=1

    https://www.reddit.com/r/electronics/comments/5i9wxd/i_just_received_my_20_ounce_pcb_soldering_is/

    That's crazy. Beautiful but crazy.

    --

    If a man will begin with certainties, he shall end with doubts,
    but if he will be content to begin with doubts he shall end in certainties. Francis Bacon

    --- SoupGate-Win32 v1.05
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  • From Lasse Langwadt Christensen@21:1/5 to All on Mon Jun 13 17:06:12 2022
    tirsdag den 14. juni 2022 kl. 01.48.36 UTC+2 skrev John Larkin:
    On Mon, 13 Jun 2022 15:57:25 -0700 (PDT), Lasse Langwadt Christensen <lang...@fonz.dk> wrote:

    tirsdag den 14. juni 2022 kl. 00.42.50 UTC+2 skrev John Larkin:
    On Sun, 12 Jun 2022 13:17:48 -0700, jla...@highlandsniptechnology.com
    wrote:
    I want to do a 6-layer pcb like

    L1 1 oz copper
    4 mil fr4
    L2 2 oz copper
    4 mil fr4
    L3 2 oz copper
    50 mil fr4
    L4 2 oz copper
    4 mil fr4
    L5 2 oz copper
    4 mil fr4
    L6 1 oz copper

    Does that sound goofy? Or expensive?
    Cirexx says it's reasonable and standard material.

    It's going to be heavy.

    https://www.dropbox.com/s/21o5hf8cal7xz6k/plugin_module.jpg?raw=1

    https://www.reddit.com/r/electronics/comments/5i9wxd/i_just_received_my_20_ounce_pcb_soldering_is/
    That's crazy. Beautiful but crazy.

    from the comments: "the side that you're looking at has -450V / 0 / +450V traces. The other side has 14V @ 150A and 24V @ 80A."

    https://usercontent.irccloud-cdn.com/file/ZjnBND2U/irccloudcapture-236812244.jpg

    I think I read about it on hackaday, afair it the board was only $2250

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  • From Anthony William Sloman@21:1/5 to Joerg on Wed Jun 15 08:52:36 2022
    On Monday, June 13, 2022 at 10:56:35 PM UTC+2, Joerg wrote:
    On 6/13/22 1:31 PM, Lasse Langwadt Christensen wrote:
    mandag den 13. juni 2022 kl. 21.46.24 UTC+2 skrev Joerg:
    On 6/12/22 1:17 PM, jla...@highlandsniptechnology.com wrote:
    I want to do a 6-layer pcb like

    L1 1 oz copper
    4 mil fr4
    L2 2 oz copper
    4 mil fr4
    L3 2 oz copper
    50 mil fr4
    L4 2 oz copper
    4 mil fr4
    L5 2 oz copper
    4 mil fr4
    L6 1 oz copper

    Does that sound goofy? Or expensive?

    Doesn't sound goofy. I have done 4oz copper.

    sure, but the thick copper is usually on the outside layers done by plating together with the vias

    Usually yes but sometimes it's needed inside for high current traces.

    There are printed circuit houses that specialise in printed transformer windings. The copper needs to end up thicker than pre-pregs it gets printed onto.

    Specialised stuff, but there seems to be quite a bit of it about, looking at the transformer cords designed to accomodate them.

    --
    Bill Sloman, Sydney

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