Re: homemade multilayer PCB?

On Tue, 27 Jan 2009 14:14:35 -0800 (PST), a7yvm109gf5d1@xxxxxxxxxxx
wrote:

On Jan 27, 3:03 pm, D from BC <myrealaddr...@xxxxxxxxx> wrote:
On Tue, 27 Jan 2009 07:10:11 -0800 (PST), laylow

<lay...@xxxxxxxxxxxxxx> wrote:
Just wondering if anyone has made their own multilayer PCBs and how
they did it. Can you buy thin blanks and laminate them somehow?

How about..

( ) solder
-------- . -------Cu layer 1
-------- . ---------FR4
-----------------Cu layer 2
-----------------FR4
-----------------Cu layer 3
-----------------FR4
-----------------Cu layer 4
-----------------FR4

Stack of single layer boards.

The hole in layer 1 is big enough to allow solder to join layers.
A few mm. It's a humongous hole.

Of course it isn't. You're assuming the holes are already plated. Try
it and let me know how it works. So the idea is you need multiple
layers because your 1mm holes eat up so much space? Absurd.

No plating. It's kinda like making a solder volcano.
I made the hole diameter such that I can wet the copper at the bottom.
Yup. The extra pcb space used by the holes are shitty but isn't that
the thing with electronics...'You don't get something for nothing'
However, I do have some ideas to try out to improve.


Joining layer 2 to 3 is done using the same technique but is soldered
prior to stacking. Adjacent layers have holes to allow space for the
solder blobs.

Take a look at the temperature needed for bonding boards. Let me know
the coefficient of expansion of solder vs. fr-4.

Without looking it up..
I think the worse happens if the interlayer vertical solder joint is
pinched by the FR4. I suppose that might cause the board to buckle.
Impossible to fix? (More lead? ...ewww..)


iow..it's assembled and connected from the inside out.

It's crappy, but doable.

I agree with 50% of that. Guess which 50%.

I've only done this technique once to join two single sided boards.
I only needed one layer to layer connection.

I'd take a photo but I have components covering the solder art.


D from BC
myrealaddress(at)comic(dot)com
British Columbia
Canada
.

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