<azonenberg_work>
so i'm running through the comb drive process now
<azonenberg_work>
just did top side hardmaskk evaporation, waiting for vacuum so i can do bottom
<azonenberg_work>
things are looking good so far
<soul-d>
k what step that  be ?
<soul-d>
also  maybe a note that  first you talk  front  and back then  change to  use top bottom
<azonenberg>
soul-d: It pretty much depends on which way you are holding the wafer :p
<azonenberg>
I just did 3 and 5, 4 can be done before or after 5 so i havent done it yet
<azonenberg>
that just involves dipping the wafer in acetone
<azonenberg>
Which has to wait until i clean out my dirty classware ;p
<azonenberg>
glassware*
<soul-d>
wich tools are a must for this hobby btw  like you made somthing out of a microscope optics?  ( egg same  idea als those old negative pictures used for enlarging )
<azonenberg>
The first thing to do is get a working contact lithography process set up at 200um feature sizes on prnited circuit boards
<azonenberg>
If you use pre-coated PCB you can rule out variability in the photoresist as a source of problems
<azonenberg>
Once you have that working, try spin-coating blank board and make sure that works
<azonenberg>
then get a microscope and build a projection exposure rig, try doing exposures onto precoated PCB and then spin coated
<azonenberg>
At this point you can start thinking about more complex processes like the ones i'm doing
<azonenberg>
One big thing that has to be worked out is evaporation
<azonenberg>
Homebrewing an evaporator is possible
<azonenberg>
it's been done
<azonenberg>
but nobody has published clear plans and drawings that i know of
<soul-d>
yeah was looking for vacuum pumps other day  but you gota watch out  what kinds of results you  get :P
<soul-d>
ill browse to my  books
<soul-d>
well not today  but got plenty of chemistry books need to read on theory of  filament evaporation it was ? first  sofar i could remmber was shematics for electric furnace
<azonenberg>
Hmm
<azonenberg>
Looks like the top hardmask didnt deposit right
<azonenberg>
I was a little worried about that tbh, i saw a nice even deposition on the bottom side but the top for some reason didnt work right
<azonenberg>
Not sure why but the top is getting etched
<azonenberg>
Good thing i have another wafer, i'll have to run the process again tomorrow
<azonenberg>
I'm gonna leave this one in KOH for an hour to see what happens
<azonenberg>
I expect it wont be usable though
<azonenberg>
Hmm, even the bottom side was weakened
<azonenberg>
something definitely went wrong
<soul-d>
those 2"Â Â expensive ?
<azonenberg>
$30
<azonenberg>
Annoying but not the end of the world
<azonenberg>
But i want to figure out what went wrong before trying it again ;p
<soul-d>
sure
<soul-d>
only need to fix my uv light box with a decent timer  and figure out if  this laser printer works well last trials on clear sheets din't go to well
<soul-d>
for pcb
<azonenberg>
i see
<azonenberg>
Let me write up my lab notes for today, sec
<azonenberg>
So basically what it looks like happened is that the Cr didnt deposit correctly
<azonenberg>
When i was depositing it, i saw a nice dark film on the bell jar near the top but very little at the bottom
<azonenberg>
I'm not sure what could cause a failure mode like that and need to do some reading / talk to some people
<azonenberg>
top of the jar that is, not the wafer
<azonenberg>
It looks like for some reason instead of the vapor spreading uniformly around the chamber, most of it went up
<soul-d>
on wiki it looked so simple
<azonenberg>
The deposition normally works fine
<azonenberg>
I probably did somethign stupid
<azonenberg>
all of my past evaporations have been successful
<azonenberg>
I think i got impatient and turned the temperature up too high
<azonenberg>
Because, as I found out earlier today
<azonenberg>
You don't evaporate chrome by melting it
<azonenberg>
it sublimes from the solid state
<azonenberg>
I kept turning it up higher because i expected it to melt
<soul-d>
tricky , reading your log forgot chat
<azonenberg>
lol
<azonenberg>
Anyway so i am going to try and do it again tomorrow
<azonenberg>
on my last unused wafer
<azonenberg>
after doing the contact mask tonight
<soul-d>
bought the final piece of equipment  since i went in  buying spree and stocked up on lots of smd stuff  bought a solder station to go with it  should help me get trough the winter  should start on some prototypes soon  also wanted to get one made sooner or later
<soul-d>
plenty of relativly cheap  pcb makers online
<azonenberg>
very nice
<soul-d>
it hurts my wallet  though
<soul-d>
but that's what hobby's are for i guess
<azonenberg>
Lol, yep
<XgF>
My friend dropped over £120 on cable connectors today... yikes...
<azonenberg>
o_O
<soul-d>
lol sounds like me  almost  but not that crazy
<XgF>
...Neutrik are expensive
<soul-d>
did buy a lvds set for 13 eur :P
<soul-d>
wich i find expensive for connecting stuff
<XgF>
The danger of working in the entertainments industry: You start acquiring your own cables. You realise how expensive the damn things are
<azonenberg>
Lol
<XgF>
Impedance match cable gets expensive when you purchase it in non-negligible lengths in non-install forms
<XgF>
....Especially when it has to be designed so that it won't break the first time some monkey rolls over it with an 130kg flightcase
<azonenberg>
wonders why most of that can't be run over ethernet / wifi as digital
<azonenberg>
then going to analog right when it hits the speaker etc
<XgF>
This is impedance matched DMX (2 core twisted pair + shield) cable for lighting. Fixtures don't take ethernet directly (yet), namely because having dozens of ethernet switches causes latency issues
<azonenberg>
Dozens of switches?
<azonenberg>
What about a single 48 or 96 port
<XgF>
Thats fine until you need to get 16 ethernet cables onto a truss...
<XgF>
Or a switch, which causes its own logistical issues, and also ethernet is more expensive that DMX
<XgF>
Lots of venues will trunk multiple DMX universes over an ethernet cable from front of house to the stage and then break it out though