L
laylow
Just wondering if anyone has made their own multilayer PCBs and how
they did it. Can you buy thin blanks and laminate them somehow?
they did it. Can you buy thin blanks and laminate them somehow?
Just wondering if anyone has made their own multilayer PCBs and how
they did it. Can you buy thin blanks and laminate them somehow?
laylow said:Just wondering if anyone has made their own multilayer PCBs and how
they did it. Can you buy thin blanks and laminate them somehow?
Just wondering if anyone has made their own multilayer PCBs and how
they did it. Can you buy thin blanks and laminate them somehow?
Jon Slaughter said:The only real challenge IMO would be dealing with the holes/vias. (except
for simple designs) Although this isn't a real technical challenge but would
be time consuming and tedius.
nospam said:Not a technical challenge? How do you propose to make connections to inner
layers of a multilayer PCB?
I haven't done it but I have thought about it.
For the most part it's just stacked individual pieces. You could just glue
several single layer pieces together(would tend to be thick though).
Um, think about it and maybe it won't be so difficult? (how do you think
they do it in the first place? magic?)
You first drill all the holes.
You do layer 1 and layer 2 this forms a new layer. Then treat that as a
single layer and do the same as the first step with layer 3. Do this until
you run out of layers. There are no interdepence between more than two
layers unless you have a via that is connected to several layers. This is a
little more tricky but not by much.
Wonderful. Now explain how you get the copper inside the drill hole,
you know, to connect all these inner layers...
laylow said:Just wondering if anyone has made their own multilayer PCBs and how
they did it. Can you buy thin blanks and laminate them somehow?
Um, if you were paying attention... or at least didn't think you knew it all
then you might get it.
Did you think you can use copper wire? huh? wouldn't that work? You do
realize that a via is the same thing as a TH? Have you ever used a lead of a
TH component to connect two sides together?
Note your so called inner layers are not inner layers until you have added a
layer. You built up the layers one at a time like any reasonably intelligent
person would do. Maybe you guys should read up on how they actually
manufacture multi-layer pcb's because I'm relativelys ure they don't start
out with all the layers unetched and sandwhiched together then use some type
of magic to get the holes and etching through.
Man... the intelligence of people supprises me every day... more so is the
arrogance.
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.
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.
I agree with 50% of that. Guess which 50%.iow..it's assembled and connected from the inside out.
It's crappy, but doable.
Forget it. Not a practical prayer in hell.....
And how, pray tell, would you now glue all this mess together without
shorts? Huh? Would that work?
How would you connect the inner layers this way? You'd only connect
the outer layers this way.
They use chemistry and drills. They etch the laminations one at a
time. Then they drill the whole mess. Then they use chemical etch to
de-smear the holes.
Then they plate the holes. It connects all the layers at the same
time.
You say "relativelys ure" about stuff you have no clue about. Who's
arrogant here?
Ok, whatever... I've never tried explaining calculus to a rock but I get the
feeling it would be similar to explaining this to you... except the rock
isn't an arrogant fool.
Wonderful. Now explain how you get the copper inside the drill hole,
you know, to connect all these inner layers...
Sorry, correct link is:ftp://panteltje.com/pub/s/wiring2.jpg
Well, I don't know why we have to insult each other. It makes usenet
a rather unpleasant place considering that it's already inundated with
meaningless spam and dreadful trolls.
Anyway, I am just a hobbyist. I don't get paid to design circuits. I
am not likely to spend $50 to have a board made for something that
only I will play with. Especially knowing that the board might not
work exactly like I want it to the first time. In other words, with
regards to hobbies, I have more time than money.
Making a multilayer pcb seemed like a fairly do-able project. I just
expected that others would have perfected a diy method by now. The
only reason I would need a third layer is for something that looked
better than a mess of jumper wires. I thought that maybe someone
might have made a special conformal coating that doubled as a heat
sensitive bonding agent or maybe a product that acted like a light
layer of some flux like adhesive. Maybe I shouldn't have said
laminate. It seems like it would be fairly easy to stack up to four
layers by soldering pins to the middle layers before sandwiching them
together. The boards wouldn't even necessarily need to touch.
I put more stock in experience than conjecture so I am intersted in
hearing about what people have tried. I also realize that many things
are easier said than done but the whole point of asking in the first
place was to try to reduce the learning curve.
Thanks for all your input.
Jan Panteltje said:If you look close you will see that the _power_ is routed by blank
wires between the dips soldered on the board.
Sorry for out of focus picture, old camera with no focus adjustment.
I have done about 10 or more boards that way for that Z80 project.
Diagrams are here, click on the system14 link, then log in for the diagrams:
http://panteltje.com/panteltje/z80/index.html
There is also a nice Z80 disassembler you can download.
Z80 was fun, good old times.
I still have that system in the attic, but I think the EPROMS must be
dead by now....
And I no longer have a monitor that can do 625 lines at 15625 Hz horizontal
frequency.
Any museum wants this?
Maybe I should put it on ebay