<john_cephalopoda>
So I should set it up? Which git hosting solution would be preferred?
<pie__>
do we actually have anyone who can set the topic?
<john_cephalopoda>
Nope. If we can't reach the founder, we will have to create a new channel.
<pie__>
i dont know who the founder is but i think i know someone who might have ops
<john_cephalopoda>
The founder is azonenberg.
<john_cephalopoda>
Last online about a month ago.
<john_cephalopoda>
And, as far as I can tell, the only person who can get op through chanserv in this channel.
<pie__>
oh, yeah hes online right now just a different nick, waiting for him to reply if he'll give ops to someone
<john_cephalopoda>
Ah, nice.
<john_cephalopoda>
Which platform would you prefer for git? gitlab? Something else?
<pie__>
i dunno i used git but htne microsoft bought it and i havent created an account anywhere else yet :P
<pie__>
so i guess just ignore me
<john_cephalopoda>
Microsoft bought it, but its rules and practices haven't changed yet.
<john_cephalopoda>
And it's not like git is hard to migrate.
<john_cephalopoda>
So my proposal would be to use github for wiki contribution for now. If microsoft does something stupid or a better solution appears, migrating will be very simple.
<john_cephalopoda>
pie__: So - have you got a github account?
<pie__>
john_cephalopoda, nope, ill just get someone else to push things for me ;P
<john_cephalopoda>
We can also use gitlab if you'd prefer it.
<pie__>
i dont have a gitlab eiher, idk
<pie__>
jn__, ^ :P
<pie__>
jn__, i hereby make the results of choosing a service your fault :P
<pie__>
jn__, pick something :P
<john_cephalopoda>
Hmm, soft lithography looks like a nice thing. It would basically be possible to create several stamps from one template, pack them and send them to interested people via mail.
Bike has quit [Quit: Lost terminal]
TheCephalopod has joined #homecmos
john_cephalopoda has quit [Ping timeout: 252 seconds]
<jn__>
pie__: should i feel like Brian (in Life Of Brian) when people suddenly start following him? :P
<jn__>
anyway, on mostly cosmetic grounds i prefer github.com over gitlab.com
<jn__>
(but i will note that i've never contributed to the homecmos idea, except by idling in this irc channel)
[X-Scale] has joined #homecmos
X-Scale has quit [Ping timeout: 246 seconds]
[X-Scale] is now known as X-Scale
gruetzkopf has quit [Read error: Connection reset by peer]
gruetzkopf has joined #homecmos
TheCephalopod is now known as john_cephalopoda
<john_cephalopoda>
jn__: It's his shoe!
<john_cephalopoda>
jn__: Only the true messiah would deny that he's the messiah! ;þ
<john_cephalopoda>
pie__, jn__: Should I create a github organisation for homecmos?
<pie__>
well, why not i guess
<pie__>
i wonder where noxz ran off to
<jn__>
john_cephalopoda: sounds good
<john_cephalopoda>
Ok, what are your user names on github?
<john_cephalopoda>
I'll add you to the organisation directly if you want. I can do it also later, if that's wanted.
<john_cephalopoda>
It's the official github organisation profile picture now.
<pie__>
now we are capable of being taken seriously >:D
<pie__>
:P
<pie__>
ad a bigger picture to the wiki readme :P
<john_cephalopoda>
Yup, I will upload the vector graphic logo to the wiki repo in a minute.
<pie__>
soon: 3d printed version
<pie__>
but it will not be complete till it ends up on a chip
<john_cephalopoda>
Yes.
<john_cephalopoda>
Unfortunately inkscape did stupid things and now the image is nowhere to be found...
<pie__>
D:
<pie__>
i saved the png but its just a png
<pie__>
time to shift through shitloads of photorec output :P or redo
<pie__>
:C
<john_cephalopoda>
pie__: I drew it as pixel graphic, saved as png, converted it to vector by hand, converted that to png, lost the svg.
<pie__>
xD noess~
<john_cephalopoda>
Now I took the rasterized vectorized raster grahic and vectorized it to get a vectorized rastorized vectorized image of a raster image.
<azonenberg_work>
john_cephalopoda: So, my plan was to start by trying to develop a metal-free lithography process
<azonenberg_work>
Don't even do any etching
<azonenberg_work>
Just try to get photoresist patterns down to a reasonably small size
<john_cephalopoda>
That's a good idea.
<azonenberg_work>
on a scrap silicon substrate
<azonenberg_work>
you can just strip resist and repeat over and over
<azonenberg_work>
This will basically involve building a mask aligner of some sort
<azonenberg_work>
I'll be buying pre-made masks from LaserLab.com to start
<azonenberg_work>
They offer plastic film masks with 3um lambda / 12um design rule
<azonenberg_work>
Which is small enough for starting out
<john_cephalopoda>
So after having a sufficiently small pattern etched into photoresist, what will be the next steps?
<azonenberg_work>
Figure out a way of vacuum depositing metal
<azonenberg_work>
This will involve me getting a working vacuum pump and building probably a filament evaporator
<azonenberg_work>
Then try to do patterns in metal on a silicon substrate (again, no active circuitry)
<azonenberg_work>
once that's done i want to break with the tradition of making transistors
<azonenberg_work>
and focus on the BEOL and packaging side
<azonenberg_work>
Take a wafer, coat with spin-on glass
<azonenberg_work>
coat with metal, pattern the metal into a resistor shape or something
<azonenberg_work>
Coat with more SOG
<azonenberg_work>
etch contact windows into the SOG over the metal
<azonenberg_work>
then drop a solder ball and tiny bit of flux onto each "bond pad"
<azonenberg_work>
and try flip-chip bonding the die to a PCB
<john_cephalopoda>
Interesting. I haven't looked much at that part of IC fab yet.
<john_cephalopoda>
Until now I only knew about wire bonding.
<azonenberg_work>
i think DIY WLCSP-BGA is an easier strategy
<azonenberg_work>
no special tooling required
<azonenberg_work>
just buy some solder balls and flux
<azonenberg_work>
tweezers, reflow oven
<azonenberg_work>
You need to be able to do overglass and glass lithography for the IC itself anyway
<azonenberg_work>
so it doesnt need any new processes or tools
<john_cephalopoda>
The process of creating very small structures with photoresist might also be of interest in conjunction with soft lithography.
<john_cephalopoda>
Photoresist structures could be created on basically any flat (and cheap) surface. No silicone required. When it's done, it can be used as the master to make soft lithography stamps.
<pie__>
silicone != silicon
<pie__>
just to be pedantic because of the channel we're in :P
<john_cephalopoda>
You neither need silicone nor silicon :þ
<azonenberg_work>
john_cephalopoda: yeah but a blank 2-inch wafer is relatively inexpensive
<azonenberg_work>
and super flat
<azonenberg_work>
So a good test sample
<azonenberg_work>
also round so easy to spin coat
<azonenberg_work>
That reminds me i wanted to build a new spin coater
<azonenberg_work>
my old one was awful
<azonenberg_work>
New one will probably be a computer fan with the blades dremeled off to reduce inertia and undesired airfloiw
<azonenberg_work>
then a little controller around it to monitor speed and do acceleration ramps etc
<john_cephalopoda>
Hm, yeah, price for the wafer is quite ok.
<pie__>
nah dude we need homecmos on 450mm
<pie__>
:P
<john_cephalopoda>
You'd need a 1500$ wafer for a single transistor :þ
<john_cephalopoda>
(Ok, a 2" wafer should do)
qu1j0t3 has joined #homecmos
<qu1j0t3>
pie__: Well hello
<jn__>
hi!
<pie__>
hai
<john_cephalopoda>
Hey
<qu1j0t3>
i must have forgotten this channel exists.
<qu1j0t3>
but i can't let pie__ have all the fun.
<john_cephalopoda>
This channel has forgotten that it exists.
<pie__>
^
<john_cephalopoda>
But now it apparently remembered.