unusual stackup...

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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
 
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
 
søndag 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.
Click to expand...

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
 
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
Click to expand...
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.
 
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
Click to expand...

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
 
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
 
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?
Click to expand...

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

--
Regards, Joerg

http://www.analogconsultants.com/
 
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.
Click to expand...

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

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

--
Regards, Joerg

http://www.analogconsultants.com/
 
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
Click to expand...

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
 
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?
Click to expand...

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
 
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
Click to expand...

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

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
 
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.
Click to expand...

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
 
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.
Click to expand...

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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